[SPARK-7890] [DOCS] Document that Spark 2.11 now supports Kafka
[SPARK-7890] [DOCS] Document that Spark 2.11 now supports Kafka

Remove caveat about Kafka / JDBC not being supported for Scala 2.11

Author: Sean Owen <sowen@cloudera.com>

Closes #6470 from srowen/SPARK-7890 and squashes the following commits:

4652634 [Sean Owen] One more rewording
7b7f3c8 [Sean Owen] Restore note about JDBC component
126744d [Sean Owen] Remove caveat about Kafka / JDBC not being supported for Scala 2.11

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