Fixed doc
Fixed doc

Just fixed a doc.

Author: Gaurav Nanda <gaurav324@gmail.com>

Closes #5576 from gaurav324/master and squashes the following commits:

8a7323f [Gaurav Nanda] Fixed doc

kevinyu98/spark,kevinyu98/spark,andrewor14/spark,bdrillard/spark,map222/spark,goldmedal/spark,zzcclp/spark,BryanCutler/spark,narahari92/spark,poffuomo/spark,someorz/spark,tejasapatil/spark,shaneknapp/spark,aosagie/spark,michalsenkyr/spark,mzl9039/spark,eyalfa/spark,ueshin/apache-spark,ConeyLiu/spark,kissmetrics/spark,jiangxb1987/spark,liyichao/spark,nilsgrabbert/spark,wangmiao1981/spark,gengliangwang/spark,liutang123/spark,big-pegasus/spark,apache-spark-on-k8s/spark,wzhfy/spark,zzcclp/spark,mdespriee/spark,apache/spark,dongjoon-hyun/spark,hhbyyh/spark,caneGuy/spark,WindCanDie/spark,icexelloss/spark,ron8hu/spark,aosagie/spark,shubhamchopra/spark,kiszk/spark,guoxiaolongzte/spark,nchammas/spark,jianran/spark,goldmedal/spark,panfengfeng/spark,ajaysaini725/spark,eyalfa/spark,aokolnychyi/spark,JoshRosen/spark,kimoonkim/spark,shaneknapp/spark,lxsmnv/spark,MLnick/spark,aosagie/spark,yanboliang/spark,kissmetrics/spark,zuotingbing/spark,yanboliang/spark,minixalpha/spark,caneGuy/spark,skonto/spark,spark-test/spark,aokolnychyi/spark,Panos-Bletsos/spark-cost-model-optimizer,michalsenkyr/spark,metamx/spark,WeichenXu123/spark,kimoonkim/spark,debugger87/spark,techaddict/spark,gioenn/xSpark,esi-mineset/spark,ptkool/spark,akopich/spark,bravo-zhang/spark,shaneknapp/spark,ConeyLiu/spark,cloud-fan/spark,ron8hu/spark,srowen/spark,cloud-fan/spark,witgo/spark,huang1900/spark,gengliangwang/spark,mike0sv/spark,Aegeaner/spark,ericvandenbergfb/spark,ddna1021/spark,aosagie/spark,adrian-ionescu/apache-spark,markhamstra/spark,caneGuy/spark,skonto/spark,narahari92/spark,jianran/spark,rednaxelafx/apache-spark,WeichenXu123/spark,gengliangwang/spark,liyichao/spark,poffuomo/spark,vinodkc/spark,metamx/spark,UndeadBaneGitHub/spark,ibm-research-ireland/sparkoscope,liyichao/spark,wangmiao1981/spark,ericvandenbergfb/spark,UndeadBaneGitHub/spark,taroplus/spark,spark-test/spark,haowu80s/spark,zuotingbing/spark,saturday-shi/spark,publicRoman/spark,1haodian/spark,esi-mineset/spark,someorz/spark,JoshRosen/spark,cin/spark,rezasafi/spark,joseph-torres/spark,SnappyDataInc/spark,lvdongr/spark,nlalevee/spark,saturday-shi/spark,lvdongr/spark,markhamstra/spark,mike0sv/spark,rekhajoshm/spark,SnappyDataInc/spark,loneknightpy/spark,dhruve/spark,sahilTakiar/spark,SHASHANKB/spark,rekhajoshm/spark,xflin/spark,1haodian/spark,stanzhai/spark,wangyum/spark,bravo-zhang/spark,ahnqirage/spark,sahilTakiar/spark,lxsmnv/spark,ddna1021/spark,jlopezmalla/spark,mahak/spark,alunarbeach/spark,aokolnychyi/spark,1haodian/spark,shubhamchopra/spark,sureshthalamati/spark,holdenk/spark,zhouyejoe/spark,skonto/spark,narahari92/spark,darionyaphet/spark,apache-spark-on-k8s/spark,stanzhai/spark,lxsmnv/spark,tengpeng/spark,sachintyagi22/spark,hvanhovell/spark,jlopezmalla/spark,icexelloss/spark,maropu/spark,SnappyDataInc/spark,mike0sv/spark,icexelloss/spark,nchammas/spark,metamx/spark,ajaysaini725/spark,techaddict/spark,setjet/spark,tengpeng/spark,kiszk/spark,publicRoman/spark,nchammas/spark,szhem/spark,zero323/spark,milliman/spark,goldmedal/spark,sachintyagi22/spark,xuanyuanking/spark,brad-kaiser/spark,tengpeng/spark,zero323/spark,markhamstra/spark,skonto/spark,tejasapatil/spark,markhamstra/spark,bravo-zhang/spark,dbtsai/spark,zzcclp/spark,srowen/spark,loneknightpy/spark,sahilTakiar/spark,BryanCutler/spark,yanboliang/spark,wzhfy/spark,stanzhai/spark,jiangxb1987/spark,WindCanDie/spark,esi-mineset/spark,JerryLead/spark,actuaryzhang/spark,metamx/spark,rikima/spark,witgo/spark,wangyum/spark,loneknightpy/spark,sachintyagi22/spark,zuotingbing/spark,yanboliang/spark,chuckchen/spark,zuotingbing/spark,bOOm-X/spark,ddna1021/spark,pgandhi999/spark,rekhajoshm/spark,kevinyu98/spark,cin/spark,techaddict/spark,highfei2011/spark,minixalpha/spark,mzl9039/spark,icexelloss/spark,ueshin/apache-spark,facaiy/spark,1haodian/spark,patrick-nicholson/spark,bdrillard/spark,mdespriee/spark,andrewor14/spark,joseph-torres/spark,HyukjinKwon/spark,chuckchen/spark,szhem/spark,MLnick/spark,WeichenXu123/spark,jkbradley/spark,Aegeaner/spark,gengliangwang/spark,guoxiaolongzte/spark,kissmetrics/spark,mahak/spark,witgo/spark,JoshRosen/spark,szhem/spark,bravo-zhang/spark,xflin/spark,chuckchen/spark,adrian-ionescu/apache-spark,sureshthalamati/spark,dongjoon-hyun/spark,SnappyDataInc/spark,holdenk/spark,minixalpha/spark,loneknightpy/spark,jrshust/spark,shuangshuangwang/spark,andrewor14/spark,SHASHANKB/spark,WindCanDie/spark,tejasapatil/spark,rikima/spark,mzl9039/spark,publicRoman/spark,zzcclp/spark,JerryLead/spark,actuaryzhang/spark,dongjoon-hyun/spark,rikima/spark,xflin/spark,panfengfeng/spark,jlopezmalla/spark,bravo-zhang/spark,cloud-fan/spark,saltstar/spark,tengpeng/spark,alunarbeach/spark,eyalfa/spark,vinodkc/spark,JerryLead/spark,bOOm-X/spark,LantaoJin/spark,rekhajoshm/spark,rikima/spark,WeichenXu123/spark,akopich/spark,nilsgrabbert/spark,narahari92/spark,janewangfb/spark,saturday-shi/spark,maropu/spark,spark-test/spark,spark-test/spark,ibm-research-ireland/sparkoscope,huang1900/spark,narahari92/spark,wzhfy/spark,huang1900/spark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