[SPARK-17567][DOCS] Use valid url to Spark RDD paper
[SPARK-17567][DOCS] Use valid url to Spark RDD paper

https://issues.apache.org/jira/browse/SPARK-17567

## What changes were proposed in this pull request?

Documentation (http://spark.apache.org/docs/latest/api/scala/#org.apache.spark.rdd.RDD) contains broken link to Spark paper (http://www.cs.berkeley.edu/~matei/papers/2012/nsdi_spark.pdf).

I found it elsewhere (https://www.usenix.org/system/files/conference/nsdi12/nsdi12-final138.pdf) and I hope it is the same one. It should be uploaded to and linked from some Apache controlled storage, so it won't break again.

## How was this patch tested?

Tested manually on local laptop.

Author: Xin Ren <iamshrek@126.com>

Closes #15121 from keypointt/SPARK-17567.

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