[SPARK-12211][DOC][GRAPHX] Fix version number in graphx doc for migration from 1.1
[SPARK-12211][DOC][GRAPHX] Fix version number in graphx doc for migration from 1.1

Migration from 1.1 section added to the GraphX doc in 1.2.0 (see https://spark.apache.org/docs/1.2.0/graphx-programming-guide.html#migrating-from-spark-11) uses \{{site.SPARK_VERSION}} as the version where changes were introduced, it should be just 1.2.

Author: Andrew Ray <ray.andrew@gmail.com>

Closes #10206 from aray/graphx-doc-1.1-migration.

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