[SPARK-15256] [SQL] [PySpark] Clarify DataFrameReader.jdbc() docstring
[SPARK-15256] [SQL] [PySpark] Clarify DataFrameReader.jdbc() docstring

This PR:
* Corrects the documentation for the `properties` parameter, which is supposed to be a dictionary and not a list.
* Generally clarifies the Python docstring for DataFrameReader.jdbc() by pulling from the [Scala docstrings](https://github.com/apache/spark/blob/b28137764716f56fa1a923c4278624a56364a505/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala#L201-L251) and rephrasing things.
* Corrects minor Sphinx typos.

Author: Nicholas Chammas <nicholas.chammas@gmail.com>

Closes #13034 from nchammas/SPARK-15256.

mzl9039/spark,szhem/spark,vinodkc/spark,dbtsai/spark,shuangshuangwang/spark,skonto/spark,panfengfeng/spark,saltstar/spark,JoshRosen/spark,sahilTakiar/spark,ConeyLiu/spark,brad-kaiser/spark,publicRoman/spark,dongjoon-hyun/spark,tengpeng/spark,ajaysaini725/spark,aosagie/spark,mahak/spark,zhouyejoe/spark,sachintyagi22/spark,nilsgrabbert/spark,jkbradley/spark,techaddict/spark,szhem/spark,highfei2011/spark,michalsenkyr/spark,markhamstra/spark,stanzhai/spark,sahilTakiar/spark,facaiy/spark,Aegeaner/spark,rikima/spark,shubhamchopra/spark,nchammas/spark,ioana-delaney/spark,shaneknapp/spark,actuaryzhang/spark,hvanhovell/spark,nchammas/spark,goldmedal/spark,ericvandenbergfb/spark,tengpeng/spark,witgo/spark,publicRoman/spark,Aegeaner/spark,ahnqirage/spark,aray/spark,ericvandenbergfb/spark,wzhfy/spark,milliman/spark,patrick-nicholson/spark,rezasafi/spark,taroplus/spark,debugger87/spark,saturday-shi/spark,darionyaphet/spark,vinodkc/spark,rekhajoshm/spark,skonto/spark,zhouyejoe/spark,gengliangwang/spark,tejasapatil/spark,MLnick/spark,JoshRosen/spark,techaddict/spark,shaneknapp/spark,brad-kaiser/spark,bdrillard/spark,nlalevee/spark,aokolnychyi/spark,alunarbeach/spark,shaneknapp/spark,Panos-Bletsos/spark-cost-model-optimizer,zzcclp/spark,akopich/spark,JoshRosen/spark,jiangxb1987/spark,darionyaphet/spark,debugger87/spark,HyukjinKwon/spark,chuckchen/spark,minixalpha/spark,Panos-Bletsos/spark-cost-model-optimizer,rednaxelafx/apache-spark,jianran/spark,debugger87/spark,lvdongr/spark,spark-test/spark,LantaoJin/spark,map222/spark,nilsgrabbert/spark,sahilTakiar/spark,JerryLead/spark,cin/spark,markhamstra/spark,guoxiaolongzte/spark,jlopezmalla/spark,rednaxelafx/apache-spark,jlopezmalla/spark,dhruve/spark,big-pegasus/spark,adrian-ionescu/apache-spark,nchammas/spark,adrian-ionescu/apache-spark,Panos-Bletsos/spark-cost-model-optimizer,liutang123/spark,janewangfb/spark,michalsenkyr/spark,alunarbeach/spark,wangyum/spark,maropu/spark,andrewor14/spark,rekhajoshm/spark,WindCanDie/spark,apache-spark-on-k8s/spark,facaiy/spark,ConeyLiu/spark,dbtsai/spark,michalsenkyr/spark,kimoonkim/spark,ueshin/apache-spark,dbtsai/spark,darionyaphet/spark,vinodkc/spark,kevinyu98/spark,darionyaphet/spark,hhbyyh/spark,gengliangwang/spark,ajaysaini725/spark,joseph-torres/spark,HyukjinKwon/spark,mdespriee/spark,markhamstra/spark,publicRoman/spark,wangyum/spark,shubhamchopra/spark,zero323/spark,taroplus/spark,darionyaphet/spark,panfengfeng/spark,JerryLead/spark,metamx/spark,guoxiaolongzte/spark,xuanyuanking/spark,ibm-research-ireland/sparkoscope,highfei2011/spark,cin/spark,xflin/spark,wangyum/spark,nchammas/spark,jiangxb1987/spark,cin/spark,taroplus/spark,joseph-torres/spark,Panos-Bletsos/spark-cost-model-optimizer,dhruve/spark,andrewor14/spark,setjet/spark,ueshin/apache-spark,UndeadBaneGitHub/spark,UndeadBaneGitHub/spark,xflin/spark,loneknightpy/spark,HyukjinKwon/spark,witgo/spark,nchammas/spark,sureshthalamati/spark,big-pegasus/spark,SnappyDataInc/spark,debugger87/spark,hhbyyh/spark,kissmetrics/spark,jkbradley/spark,big-pegasus/spark,vinodkc/spark,ddna1021/spark,patrick-nicholson/spark,1haodian/spark,apache/spark,WeichenXu123/spark,lxsmnv/spark,ddna1021/spark,pgandhi999/spark,janewangfb/spark,ueshin/apache-spark,srowen/spark,ioana-delaney/spark,rezasafi/spark,kiszk/spark,jrshust/spark,minixalpha/spark,JerryLead/spark,tengpeng/spark,panfengfeng/spark,aosagie/spark,hhbyyh/spark,goldmedal/spark,zhouyejoe/spark,wzhfy/spark,bOOm-X/spark,sahilTakiar/spark,ConeyLiu/spark,akopich/spark,zhouyejoe/spark,big-pegasus/spark,jianran/spark,SHASHANKB/spark,maropu/spark,1haodian/spark,liutang123/spark,brad-kaiser/spark,poffuomo/spark,kimoonkim/spark,WindCanDie/spark,MLnick/spark,spark-test/spark,rekhajoshm/spark,caneGuy/spark,saltstar/spark,sureshthalamati/spark,apache-spark-on-k8s/spark,HyukjinKwon/spark,kevinyu98/spark,zero323/spark,liutang123/spark,rednaxelafx/apache-spark,caneGuy/spark,chuckchen/spark,apache/spark,rikima/spark,dbtsai/spark,JerryLead/spark,yanboliang/spark,brad-kaiser/spark,cloud-fan/spark,WeichenXu123/spark,zzcclp/spark,someorz/spark,xflin/spark,vinodkc/spark,aray/spark,joseph-torres/spark,ptkool/spark,zzcclp/spark,kevinyu98/spark,aray/spark,minixalpha/spark,wangyum/spark,bravo-zhang/spark,kissmetrics/spark,skonto/spark,byakuinss/spark,alunarbeach/spark,zzcclp/spark,dongjoon-hyun/spark,sachintyagi22/spark,loneknightpy/spark,publicRoman/spark,gengliangwang/spark,zuotingbing/spark,shuangshuangwang/spark,tengpeng/spark,szhem/spark,milliman/spark,ericvandenbergfb/spark,SnappyDataInc/spark,someorz/spark,WeichenXu123/spark,debugger87/spark,liyichao/spark,esi-mineset/spark,jlopezmalla/spark,guoxiaolongzte/spark,yanboliang/spark,ajaysaini725/spark,kimoonkim/spark,ConeyLiu/spark,hhbyyh/spark,srowen/spark,wzhfy/spark,1haodian/spark,chuckchen/spark,guoxiaolongzte/spark,nlalevee/spark,hhbyyh/spark,alunarbeach/spark,patrick-nicholson/spark,UndeadBaneGitHub/spark,andrewor14/spark,aosagie/spark,nlalevee/spark,JerryLead/spark,markhamstra/spark,ioana-delaney/spark,stanzhai/spark,SnappyDataInc/spark,zzcclp/spark,lvdongr/spark,JoshRosen/spark,JerryLead/spark,janewangfb/spark,ueshin/apache-spark,HyukjinKwon/spark,icexelloss/spark,techaddict/spark,ddna1021/spark,kissmetrics/spark,lxsmnv/spark,saltstar/spark,nlalevee/spark,highfei2011/spark,loneknightpy/spark,caneGuy/spark,maropu/spark,esi-mineset/spark,ueshin/apache-spark,rekhajoshm/spark,MLnick/spark,rikima/spark,michalsenkyr/spark,aosagie/spark,bdrillard/spark,kiszk/spark,guoxiaolongzte/spark,kimoonkim/spark,BryanCutler/spark,SHASHANKB/spark,michalsenkyr/spark,JoshRosen/spark,ConeyLiu/spark,rikima/spark,BryanCutler/spark,SHASHANKB/spark,liyichao/spark,goldmedal/spark,rikima/spark,xuanyuanking/spark,gengliangwang/spark,jkbradley/spark,hvanhovell/spark,saturday-shi/spark,sureshthalamati/spark,lxsmnv/spark,ajaysaini725/spark,mike0sv/spark,liutang123/spark,holdenk/spark,ioana-delaney/spark,jkbradley/spark,dhruve/spark,adrian-ionescu/apache-spark,byakuinss/spark,WindCanDie/spark,shaneknapp/spark,srowen/spark,mdespriee/spark,shuangshuangwang/spark,zero323/spark,ericvandenbergfb/spark,dhruve/spark,bOOm-X/spark,Panos-Bletsos/spark-cost-model-optimizer,pgandhi999/spark,SnappyDataInc/spark,mzl9039/spark,bOOm-X/spark,big-pegasus/spark,zuotingbing/spark,pgandhi999/spark,liyichao/spark,esi-mineset/spark,mike0sv/spark,kimoonkim/spark,hvanhovell/spark,kiszk/spark,saturday-shi/spark,apache-spark-on-k8s/spark,joseph-torres/spark,kissmetrics/spark,milliman/spark,eyalfa/spark,liyichao/spark,someorz/spark,BryanCutler/spark,actuaryzhang/spark,mike0sv/spark,bravo-zhang/spark,aosagie/spark,wangmiao1981/spark,adrian-ionescu/apache-spark,bdrillard/spark,liutang123/spark,rednaxelafx/apache-spark,1haodian/spark,vinodkc/spark,srowen/spark,wangmiao1981/spark,bravo-zhang/spark,taroplus/spark,jrshust/spark,map222/spark,ahnqirage/spark,ueshin/apache-spark,BryanCutler/spark,1haodian/spark,apache-spark-on-k8s/spark,zzcclp/spark,spark-test/spark,aosagie/spark,map222/spark,ptkool/spark,gengliangwang/spark,eyalfa/spark,shubhamchopra/spark,ioana-delaney/spark,hhbyyh/spark,akopich/spark,cin/spark,SnappyDataInc/spark,kevinyu98/spark,mahak/spark,apache/spark,goldmedal/spark,akopich/spark,yanboliang/spark,taroplus/spark,LantaoJin/spark,ddna1021/spark,Aegeaner/spark,stanzhai/spark,witgo/spark,setjet/spark,holdenk/spark,icexelloss/spark,aokolnychyi/spark,xuanyuanking/spark,panfengfeng/spark,hvanhovell/spark,michalsenkyr/spark,adrian-ionescu/apache-spark,saturday-shi/spark,chuckchen/spark,facaiy/spark,sachintyagi22/spark,metamx/spark,shuangshuangwang/spark,bOOm-X/spark,metamx/spark,jrshust/spark,bOOm-X/spark,mdespriee/spark,icexelloss/spark,sahilTakiar/spark,1haodian/spark,shaneknapp/spark,highfei2011/spark,spark-test/spark,markhamstra/spark,ConeyLiu/spark,ron8hu/spark,panfengfeng/spark,jianran/spark,ioana-delaney/spark,metamx/spark,goldmedal/spark,1haodian/spark,saturday-shi/spark,MLnick/spark,cloud-fan/spark,ron8hu/spark,markhamstra/spark,chuckchen/spark,rezasafi/spark,ahnqirage/spark,srowen/spark,zuotingbing/spark,narahari92/spark,stanzhai/spark,zero323/spark,ddna1021/spark,rikima/spark,dongjoon-hyun/spark,zero323/spark,apache-spark-on-k8s/spark,eyalfa/spark,dbtsai/spark,wangmiao1981/spark,ibm-research-ireland/sparkoscope,jiangxb1987/spark,nilsgrabbert/spark,ptkool/spark,eyalfa/spark,actuaryzhang/spark,janewangfb/spark,WindCanDie/spark,JoshRosen/spark,hvanhovell/spark,adrian-ionescu/apache-spark,highfei2011/spark,MLnick/spark,Panos-Bletsos/spark-cost-model-optimizer,patrick-nicholson/spark,sahilTakiar/spark,WeichenXu123/spark,tengpeng/spark,kissmetrics/spark,liutang123/spark,huang1900/spark,patrick-nicholson/spark,matthewfranglen/spark,stanzhai/spark,map222/spark,wzhfy/spark,kiszk/spark,UndeadBaneGitHub/spark,someorz/spark,cloud-fan/spark,ericvandenbergfb/spark,yanboliang/spark,maropu/spark,rezasafi/spark,ddna1021/spark,bdrillard/spark,cin/spark,narahari92/spark,ahnqirage/spark,jkbradley/spark,xuanyuanking/spark,icexelloss/spark,andrewor14/spark,andrewor14/spark,sureshthalamati/spark,minixalpha/spark,WeichenXu123/spark,byakuinss/spark,dbtsai/spark,ptkool/spark,wzhfy/spark,darionyaphet/spark,ahnqirage/spark,dbtsai/spark,bdrillard/spark,zhouyejoe/spark,metamx/spark,aokolnychyi/spark,rednaxelafx/apache-spark,poffuomo/spark,kiszk/spark,rednaxelafx/apache-spark,minixalpha/spark,aray/spark,milliman/spark,mdespriee/spark,wangmiao1981/spark,shaneknapp/spark,facaiy/spark,zzcclp/spark,kimoonkim/spark,kiszk/spark,hvanhovell/spark,brad-kaiser/spark,xflin/spark,narahari92/spark,setjet/spark,xuanyuanking/spark,mzl9039/spark,huang1900/spark,nilsgrabbert/spark,zhouyejoe/spark,liyichao/spark,techaddict/spark,apache/spark,dhruve/spark,spark-test/spark,shuangshuangwang/spark,wzhfy/spark,panfengfeng/spark,apache/spark,jiangxb1987/spark,jrshust/spark,janewangfb/spark,sachintyagi22/spark,mdespriee/spark,byakuinss/spark,wangmiao1981/spark,LantaoJin/spark,yanboliang/spark,xflin/spark,wangyum/spark,esi-mineset/spark,tejasapatil/spark,sachintyagi22/spark,JerryLead/spark,nilsgrabbert/spark,bOOm-X/spark,jiangxb1987/spark,Aegeaner/spark,LantaoJin/spark,huang1900/spark,mzl9039/spark,someorz/spark,bOOm-X/spark,esi-mineset/spark,rezasafi/spark,liyichao/spark,pgandhi999/spark,facaiy/spark,apache-spark-on-k8s/spark,witgo/spark,ahnqirage/spark,tejasapatil/spark,holdenk/spark,lxsmnv/spark,milliman/spark,mike0sv/spark,huang1900/spark,LantaoJin/spark,szhem/spark,map222/spark,zuotingbing/spark,nilsgrabbert/spark,chuckchen/spark,lxsmnv/spark,SHASHANKB/spark,dongjoon-hyun/spark,jiangxb1987/spark,highfei2011/spark,huang1900/spark,patrick-nicholson/spark,gengliangwang/spark,aray/spark,facaiy/spark,map222/spark,liutang123/spark,bdrillard/spark,aray/spark,holdenk/spark,bdrillard/spark,wzhfy/spark,xflin/spark,kimoonkim/spark,shubhamchopra/spark,poffuomo/spark,joseph-torres/spark,dongjoon-hyun/spark,ajaysaini725/spark,mahak/spark,chuckchen/spark,kevinyu98/spark,bravo-zhang/spark,nlalevee/spark,debugger87/spark,caneGuy/spark,eyalfa/spark,guoxiaolongzte/spark,xuanyuanking/spark,WindCanDie/spark,sachintyagi22/spark,bravo-zhang/spark,shuangshuangwang/spark,WindCanDie/spark,ddna1021/spark,metamx/spark,srowen/spark,aokolnychyi/spark,ericvandenbergfb/spark,alunarbeach/spark,byakuinss/spark,minixalpha/spark,actuaryzhang/spark,sureshthalamati/spark,jiangxb1987/spark,skonto/spark,maropu/spark,JoshRosen/spark,zero323/spark,szhem/spark,xuanyuanking/spark,someorz/spark,big-pegasus/spark,poffuomo/spark,akopich/spark,caneGuy/spark,saltstar/spark,vinodkc/spark,stanzhai/spark,ahnqirage/spark,zuotingbing/spark,janewangfb/spark,UndeadBaneGitHub/spark,mike0sv/spark,icexelloss/spark,facaiy/spark,goldmedal/spark,narahari92/spark,BryanCutler/spark,yanboliang/spark,apache/spark,SHASHANKB/spark,big-pegasus/spark,wangmiao1981/spark,jianran/spark,lxsmnv/spark,ptkool/spark,WeichenXu123/spark,holdenk/spark,HyukjinKwon/spark,brad-kaiser/spark,ibm-research-ireland/sparkoscope,shubhamchopra/spark,actuaryzhang/spark,nchammas/spark,mahak/spark,holdenk/spark,nlalevee/spark,Panos-Bletsos/spark-cost-model-optimizer,jkbradley/spark,SnappyDataInc/spark,kevinyu98/spark,lvdongr/spark,saltstar/spark,wangyum/spark,icexelloss/spark,joseph-torres/spark,tejasapatil/spark,nchammas/spark,rekhajoshm/spark,shubhamchopra/spark,dhruve/spark,jianran/spark,ron8hu/spark,szhem/spark,sureshthalamati/spark,UndeadBaneGitHub/spark,darionyaphet/spark,metamx/spark,cloud-fan/spark,zuotingbing/spark,zhouyejoe/spark,loneknightpy/spark,shaneknapp/spark,ptkool/spark,wangyum/spark,jkbradley/spark,setjet/spark,aokolnychyi/spark,mike0sv/spark,techaddict/spark,esi-mineset/spark,narahari92/spark,Aegeaner/spark,shubhamchopra/spark,skonto/spark,saltstar/spark,byakuinss/spark,setjet/spark,ConeyLiu/spark,michalsenkyr/spark,lvdongr/spark,witgo/spark,lvdongr/spark,MLnick/spark,jrshust/spark,setjet/spark,ibm-research-ireland/sparkoscope,cloud-fan/spark,andrewor14/spark,apache/spark,aray/spark,kissmetrics/spark,WindCanDie/spark,huang1900/spark,witgo/spark,LantaoJin/spark,SHASHANKB/spark,ericvandenbergfb/spark,apache-spark-on-k8s/spark,ueshin/apache-spark,minixalpha/spark,BryanCutler/spark,publicRoman/spark,tejasapatil/spark,icexelloss/spark,andrewor14/spark,panfengfeng/spark,ibm-research-ireland/sparkoscope,sureshthalamati/spark,szhem/spark,kiszk/spark,caneGuy/spark,jianran/spark,aokolnychyi/spark,jlopezmalla/spark,nlalevee/spark,caneGuy/spark,ron8hu/spark,saltstar/spark,LantaoJin/spark,ajaysaini725/spark,poffuomo/spark,cin/spark,aokolnychyi/spark,kissmetrics/spark,taroplus/spark,zuotingbing/spark,ptkool/spark,cin/spark,tengpeng/spark,someorz/spark,alunarbeach/spark,witgo/spark,map222/spark,brad-kaiser/spark,milliman/spark,lxsmnv/spark,nilsgrabbert/spark,setjet/spark,rekhajoshm/spark,wangmiao1981/spark,UndeadBaneGitHub/spark,zero323/spark,markhamstra/spark,mdespriee/spark,jrshust/spark,mike0sv/spark,ron8hu/spark,milliman/spark,rednaxelafx/apache-spark,ioana-delaney/spark,debugger87/spark,hhbyyh/spark,dongjoon-hyun/spark,huang1900/spark,skonto/spark,mdespriee/spark,gengliangwang/spark,lvdongr/spark,maropu/spark,stanzhai/spark,akopich/spark,holdenk/spark,MLnick/spark,tejasapatil/spark,ibm-research-ireland/sparkoscope,mahak/spark,maropu/spark,rikima/spark,mzl9039/spark,skonto/spark,actuaryzhang/spark,WeichenXu123/spark,ibm-research-ireland/sparkoscope,aosagie/spark,mzl9039/spark,liyichao/spark,lvdongr/spark,yanboliang/spark,loneknightpy/spark,byakuinss/spark,shuangshuangwang/spark,ron8hu/spark,mzl9039/spark,guoxiaolongzte/spark,highfei2011/spark,bravo-zhang/spark,hvanhovell/spark,spark-test/spark,taroplus/spark,alunarbeach/spark,pgandhi999/spark,poffuomo/spark,srowen/spark,HyukjinKwon/spark,saturday-shi/spark,akopich/spark,loneknightpy/spark,BryanCutler/spark,spark-test/spark,publicRoman/spark,mahak/spark,goldmedal/spark,jlopezmalla/spark,mahak/spark,SHASHANKB/spark,saturday-shi/spark,poffuomo/spark,techaddict/spark,cloud-fan/spark,ajaysaini725/spark,sachintyagi22/spark,jrshust/spark,techaddict/spark,narahari92/spark,Aegeaner/spark,Aegeaner/spark,pgandhi999/spark,rekhajoshm/spark,jlopezmalla/spark,janewangfb/spark,eyalfa/spark,jianran/spark,cloud-fan/spark,xflin/spark,dongjoon-hyun/spark,sahilTakiar/spark,ron8hu/spark,jlopezmalla/spark,publicRoman/spark,rezasafi/spark,loneknightpy/spark,tejasapatil/spark,pgandhi999/spark,adrian-ionescu/apache-spark,rezasafi/spark,SnappyDataInc/spark,kevinyu98/spark,actuaryzhang/spark,bravo-zhang/spark,narahari92/spark,tengpeng/spark,eyalfa/spark,patrick-nicholson/spark,esi-mineset/spark,dhruve/spark,joseph-torres/spark