[SPARK-13705][DOCS] UpdateStateByKey Operation documentation incorrectly refers to StatefulNetworkWordCount
[SPARK-13705][DOCS] UpdateStateByKey Operation documentation incorrectly refers to StatefulNetworkWordCount

## What changes were proposed in this pull request?
The reference to StatefulNetworkWordCount.scala from updateStatesByKey documentation should be removed, till there is a example for updateStatesByKey.

## How was this patch tested?
Have tested the new documentation with jekyll build.

Author: rmishra <rmishra@pivotal.io>

Closes #11545 from rishitesh/SPARK-13705.

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