[SPARK-18849][ML][SPARKR][DOC] vignettes final check update
[SPARK-18849][ML][SPARKR][DOC] vignettes final check update

## What changes were proposed in this pull request?

doc cleanup

## How was this patch tested?

~~vignettes is not building for me. I'm going to kick off a full clean build and try again and attach output here for review.~~
Output html here: https://felixcheung.github.io/sparkr-vignettes.html

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #16286 from felixcheung/rvignettespass.

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