[DOCS][SQL] Add a Note on jsonFile having separate JSON objects per line
[DOCS][SQL] Add a Note on jsonFile having separate JSON objects per line

* This commit hopes to avoid the confusion I faced when trying
  to submit a regular, valid multi-line JSON file, also see

  http://apache-spark-user-list.1001560.n3.nabble.com/Loading-JSON-Dataset-fails-with-com-fasterxml-jackson-databind-JsonMappingException-td20041.html

Author: Peter Vandenabeele <peter@vandenabeele.com>

Closes #3517 from petervandenabeele/pv-docs-note-on-jsonFile-format/01 and squashes the following commits:

1f98e52 [Peter Vandenabeele] Revert to people.json and simple Note text
6b6e062 [Peter Vandenabeele] Change the "JSON" connotation to "txt"
fca7dfb [Peter Vandenabeele] Add a Note on jsonFile having separate JSON objects per line

wzhfy/spark,ueshin/apache-spark,skonto/spark,WeichenXu123/spark,byakuinss/spark,guoxiaolongzte/spark,ahnqirage/spark,yanboliang/spark,adrian-ionescu/apache-spark,nchammas/spark,stanzhai/spark,byakuinss/spark,kevinyu98/spark,JerryLead/spark,bOOm-X/spark,ajaysaini725/spark,gioenn/xSpark,apache-spark-on-k8s/spark,narahari92/spark,rikima/spark,UndeadBaneGitHub/spark,ibm-research-ireland/sparkoscope,haowu80s/spark,ioana-delaney/spark,1haodian/spark,map222/spark,narahari92/spark,bravo-zhang/spark,ioana-delaney/spark,Aegeaner/spark,skonto/spark,esi-mineset/spark,gengliangwang/spark,HyukjinKwon/spark,Aegeaner/spark,gioenn/xSpark,WindCanDie/spark,ptkool/spark,icexelloss/spark,metamx/spark,janewangfb/spark,andrewor14/iolap,andrewor14/iolap,rezasafi/spark,highfei2011/spark,darionyaphet/spark,mzl9039/spark,SHASHANKB/spark,kissmetrics/spark,dongjoon-hyun/spark,zhouyejoe/spark,markhamstra/spark,szhem/spark,bdrillard/spark,zero323/spark,actuaryzhang/spark,joseph-torres/spark,JoshRosen/spark,liutang123/spark,spark-test/spark,akopich/spark,esi-mineset/spark,rikima/spark,tengpeng/spark,taroplus/spark,rikima/spark,actuaryzhang/spark,witgo/spark,someorz/spark,SnappyDataInc/spark,ajaysaini725/spark,ericvandenbergfb/spark,aosagie/spark,patrick-nicholson/spark,mike0sv/spark,zzcclp/spark,zero323/spark,dongjoon-hyun/spark,rikima/spark,mdespriee/spark,kevinyu98/spark,HyukjinKwon/spark,jrshust/spark,ron8hu/spark,brad-kaiser/spark,icexelloss/spark,publicRoman/spark,ibm-research-ireland/sparkoscope,xflin/spark,jkbradley/spark,esi-mineset/spark,big-pegasus/spark,gengliangwang/spark,liyichao/spark,rezasafi/spark,kevinyu98/spark,ddna1021/spark,aosagie/spark,jianran/spark,ConeyLiu/spark,MLnick/spark,jiangxb1987/spark,jiangxb1987/spark,tejasapatil/spark,caneGuy/spark,rekhajoshm/spark,WindCanDie/spark,maropu/spark,srowen/spark,witgo/spark,huang1900/spark,akopich/spark,shubhamchopra/spark,taroplus/spark,shaneknapp/spark,LantaoJin/spark,JerryLead/spark,nchammas/spark,sachintyagi22/spark,sahilTakiar/spark,shaneknapp/spark,liyichao/spark,dhruve/spark,jkbradley/spark,mahak/spark,ptkool/spark,markhamstra/spark,ajaysaini725/spark,skonto/spark,jianran/spark,ddna1021/spark,map222/spark,debugger87/spark,liyichao/spark,shubhamchopra/spark,kiszk/spark,jrshust/spark,akopich/spark,lvdongr/spark,SHASHANKB/spark,jlopezmalla/spark,Panos-Bletsos/spark-cost-model-optimizer,mike0sv/spark,metamx/spark,hvanhovell/spark,Panos-Bletsos/spark-cost-model-optimizer,nlalevee/spark,aokolnychyi/spark,xuanyuanking/spark,actuaryzhang/spark,bravo-zhang/spark,markhamstra/spark,saturday-shi/spark,someorz/spark,brad-kaiser/spark,LantaoJin/spark,zero323/spark,sachintyagi22/spark,lvdongr/spark,nchammas/spark,kiszk/spark,vinodkc/spark,vinodkc/spark,publicRoman/spark,poffuomo/spark,goldmedal/spark,pgandhi999/spark,eyalfa/spark,bOOm-X/spark,ddna1021/spark,bdrillard/spark,dhruve/spark,loneknightpy/spark,holdenk/spark,rekhajoshm/spark,michalsenkyr/spark,alunarbeach/spark,aosagie/spark,debugger87/spark,dhruve/spark,ron8hu/spark,highfei2011/spark,guoxiaolongzte/spark,kiszk/spark,spark-test/spark,ueshin/apache-spark,pgandhi999/spark,cloud-fan/spark,techaddict/spark,adrian-ionescu/apache-spark,UndeadBaneGitHub/spark,goldmedal/spark,SnappyDataInc/spark,srowen/spark,rednaxelafx/apache-spark,WeichenXu123/spark,ptkool/spark,sureshthalamati/spark,rednaxelafx/apache-spark,aokolnychyi/spark,highfei2011/spark,facaiy/spark,joseph-torres/spark,JerryLead/spark,sahilTakiar/spark,ptkool/spark,minixalpha/spark,ajaysaini725/spark,kissmetrics/spark,SnappyDataInc/spark,pronix/spark,sureshthalamati/spark,xflin/spark,publicRoman/spark,saturday-shi/spark,lvdongr/spark,alunarbeach/spark,publicRoman/spark,darionyaphet/spark,kimoonkim/spark,jlopezmalla/spark,cin/spark,skonto/spark,SnappyDataInc/spark,setjet/spark,szhem/spark,adrian-ionescu/apache-spark,saltstar/spark,nchammas/spark,janewangfb/spark,guoxiaolongzte/spark,hhbyyh/spark,patrick-nicholson/spark,zzcclp/spark,vinodkc/spark,dongjoon-hyun/spark,andrewor14/spark,mahak/spark,BryanCutler/spark,panfengfeng/spark,dbtsai/spark,aokolnychyi/spark,liutang123/spark,janewangfb/spark,milliman/spark,shaneknapp/spark,alunarbeach/spark,nlalevee/spark,kissmetrics/spark,ConeyLiu/spark,saltstar/spark,esi-mineset/spark,darionyaphet/spark,caneGuy/spark,srowen/spark,mike0sv/spark,dbtsai/spark,panfengfeng/spark,saltstar/spark,srowen/spark,xuanyuanking/spark,MLnick/spark,saturday-shi/spark,MLnick/spark,facaiy/spark,cloud-fan/spark,shaneknapp/spark,lxsmnv/spark,janewangfb/spark,apache/spark,debugger87/spark,patrick-nicholson/spark,andrewor14/spark,facaiy/spark,wangyum/spark,Aegeaner/spark,icexelloss/spark,adrian-ionescu/apache-spark,adrian-ionescu/apache-spark,MLnick/spark,pgandhi999/spark,nchammas/spark,szhem/spark,hvanhovell/spark,xflin/spark,metamx/spark,loneknightpy/spark,mdespriee/spark,facaiy/spark,zhouyejoe/spark,LantaoJin/spark,wzhfy/spark,nilsgrabbert/spark,szhem/spark,taroplus/spark,saltstar/spark,JoshRosen/spark,yanboliang/spark,cin/spark,pgandhi999/spark,techaddict/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