Update tuning.md
Update tuning.md

Make the example more compilable
darionyaphet/spark,xflin/spark,wzhfy/spark,bravo-zhang/spark,bdrillard/spark,esi-mineset/spark,goldmedal/spark,setjet/spark,jianran/spark,byakuinss/spark,bravo-zhang/spark,milliman/spark,aray/spark,WindCanDie/spark,ahnqirage/spark,skonto/spark,mzl9039/spark,ahnqirage/spark,panfengfeng/spark,mahak/spark,caneGuy/spark,mkolod/incubator-spark,SnappyDataInc/spark,sryza/spark,guoxiaolongzte/spark,zzcclp/spark,ericvandenbergfb/spark,wangmiao1981/spark,jianran/spark,apache-spark-on-k8s/spark,WindCanDie/spark,jlopezmalla/spark,gioenn/xSpark,jlopezmalla/spark,byakuinss/spark,bdrillard/spark,zero323/spark,UndeadBaneGitHub/spark,debugger87/spark,mdespriee/spark,koeninger/spark,ptkool/spark,SnappyDataInc/spark,zero323/spark,shaneknapp/spark,zzcclp/spark,jiangxb1987/spark,mike0sv/spark,actuaryzhang/spark,poffuomo/spark,loneknightpy/spark,mdespriee/spark,bdrillard/spark,SHASHANKB/spark,michalsenkyr/spark,aray/spark,vax11780/spark,witgo/spark,ptkool/spark,kevinyu98/spark,lyogavin/spark,saltstar/spark,hhbyyh/spark,UndeadBaneGitHub/spark,ericvandenbergfb/spark,goldmedal/spark,jrshust/spark,mahak/spark,publicRoman/spark,srowen/spark,kissmetrics/spark,MLnick/spark,bOOm-X/spark,kiszk/spark,gioenn/xSpark,saltstar/spark,WindCanDie/spark,stanzhai/spark,eyalfa/spark,mdespriee/spark,JerryLead/spark,setjet/spark,zzcclp/spark,markhamstra/spark,mkolod/incubator-spark,zhouyejoe/spark,vax11780/spark,nchammas/spark,aosagie/spark,gioenn/xSpark,witgo/spark,tengpeng/spark,holdenk/spark,andrewor14/spark,witgo/spark,zhouyejoe/spark,map222/spark,kevinyu98/spark,andrewor14/spark,nlalevee/spark,mike0sv/spark,jkbradley/spark,big-pegasus/spark,brad-kaiser/spark,cloud-fan/spark,panfengfeng/spark,szhem/spark,sryza/spark,mdespriee/spark,shubhamchopra/spark,techaddict/spark,patrick-nicholson/spark,xflin/spark,liyichao/spark,milliman/spark,wzhfy/spark,hhbyyh/spark,ueshin/apache-spark,highfei2011/spark,ptkool/spark,kimoonkim/spark,zero323/spark,andrewor14/spark,mike0sv/spark,jianran/spark,gengliangwang/spark,someorz/spark,sachintyagi22/spark,wangmiao1981/spark,yanboliang/spark,sahilTakiar/spark,bravo-zhang/spark,skonto/spark,narahari92/spark,zero323/spark,someorz/spark,caneGuy/spark,aosagie/spark,SHASHANKB/spark,lvdongr/spark,lyogavin/spark,rekhajoshm/spark,ajaysaini725/spark,dongjoon-hyun/spark,rikima/spark,brad-kaiser/spark,mdespriee/spark,taroplus/spark,HyukjinKwon/spark,kimoonkim/spark,apache/spark,ueshin/apache-spark,darionyaphet/spark,dongjoon-hyun/spark,rjpower/spark,gioenn/xSpark,jiangxb1987/spark,jianran/spark,lvdongr/spark,vax11780/spark,Aegeaner/spark,jlopezmalla/spark,vinodkc/spark,stanzhai/spark,SnappyDataInc/spark,kiszk/spark,taroplus/spark,rezasafi/spark,jianran/spark,ron8hu/spark,joseph-torres/spark,highfei2011/spark,map222/spark,apache/spark,poffuomo/spark,janewangfb/spark,Panos-Bletsos/spark-cost-model-optimizer,rekhajoshm/spark,dhruve/spark,gengliangwang/spark,jkbradley/spark,rednaxelafx/apache-spark,setjet/spark,aokolnychyi/spark,sureshthalamati/spark,publicRoman/spark,ahnqirage/spark,1haodian/spark,mike0sv/spark,tejasapatil/spark,caneGuy/spark,skonto/spark,shaneknapp/spark,adrian-ionescu/apache-spark,SHASHANKB/spark,debugger87/spark,pgandhi999/spark,kiszk/spark,ueshin/apache-spark,apache/spark,patrick-nicholson/spark,yanboliang/spark,maropu/spark,MLnick/spark,hvanhovell/spark,apache/spark,dotunolafunmiloye/spark,lxsmnv/spark,apache-spark-on-k8s/spark,minixalpha/spark,pronix/spark,maropu/spark,panfengfeng/spark,cloudera/spark,gengliangwang/spark,bravo-zhang/spark,aokolnychyi/spark,patrick-nicholson/spark,facaiy/spark,darionyaphet/spark,maropu/spark,someorz/spark,gioenn/xSpark,HyukjinKwon/spark,andrewor14/iolap,pronix/spark,szhem/spark,patrick-nicholson/spark,narahari92/spark,bOOm-X/spark,Aegeaner/spark,HyukjinKwon/spark,mahak/spark,szhem/spark,zzcclp/spark,LantaoJin/spark,joseph-torres/spark,spark-test/spark,brad-kaiser/spark,wgpshashank/spark,jiangxb1987/spark,spark-test/spark,MLnick/spark,dotunolafunmiloye/spark,mdespriee/spark,wangyum/spark,icexelloss/spark,MLnick/spark,rjpower/spark,ron8hu/spark,ioana-delaney/spark,LantaoJin/spark,cloud-fan/spark,tejasapatil/spark,rekhajoshm/spark,tengpeng/spark,adrian-ionescu/apache-spark,saltstar/spark,nlalevee/spark,aokolnychyi/spark,taroplus/spark,dhruve/spark,tejasapatil/spark,tengpeng/spark,liyichao/spark,cin/spark,loneknightpy/spark,guoxiaolongzte/spark,pgandhi999/spark,markhamstra/spark,dotunolafunmiloye/spark,szhem/spark,dhruve/spark,jianran/spark,publicRoman/spark,metamx/spark,JerryLead/spark,MLnick/spark,jkbradley/spark,jlopezmalla/spark,techaddict/spark,cloudera/spark,adrian-ionescu/apache-spark,lyogavin/spark,haowu80s/spark,eyalfa/spark,techaddict/spark,big-pegasus/spark,rekhajoshm/spark,rekhajoshm/spark,gengliangwang/spark,zuotingbing/spark,minixalpha/spark,Aegeaner/spark,rikima/spark,cloudera/spark,poffuomo/spark,bOOm-X/spark,ibm-research-ireland/sparkoscope,dbtsai/spark,bOOm-X/spark,WindCanDie/spark,rikima/spark,holdenk/spark,UndeadBaneGitHub/spark,sachintyagi22/spark,alunarbeach/s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Bletsos/spark-cost-model-optimizer,lxsmnv/spark,BryanCutler/spark,vinodkc/spark,skonto/spark,shuangshuangwang/spark,highfei2011/spark,aokolnychyi/spark,icexelloss/spark,shuangshuangwang/spark,ajaysaini725/spark,BryanCutler/spark,spark-test/spark,kimoonkim/spark,nilsgrabbert/spark,poffuomo/spark,techaddict/spark,jlopezmalla/spark,maropu/spark,jkbradley/spark,akopich/spark,esi-mineset/spark,cin/spark,jrshust/spark,ConeyLiu/spark,actuaryzhang/spark,aokolnychyi/spark,liutang123/spark,bOOm-X/spark,nilsgrabbert/spark,rikima/spark,ueshin/apache-spark,michalsenkyr/spark,ajaysaini725/spark,ueshin/apache-spark,panfengfeng/spark,setjet/spark,ajaysaini725/spark,hvanhovell/spark,sryza/spark,xflin/spark,byakuinss/spark,Panos-Bletsos/spark-cost-model-optimizer,mahak/spark,chuckchen/spark,byakuinss/spark,cloud-fan/spark,witgo/spark,joseph-torres/spark,publicRoman/spark,apache-spark-on-k8s/spark,cin/spark,ptkool/spark,kiszk/spark,Panos-Bletsos/spark-cost-model-optimizer,shubhamchopra/spark,saturday-shi/spark,ajaysaini725/spark,vinodkc/spark,andrewor14/iolap,1haodian/spark,nlalevee/spark,apache/spark,wangmiao1981/spark,ericvandenbergfb/spark,markhamstra/spark,haowu80s/spark,huang1900/spark,sachintyagi22/spark,facaiy/spark,adrian-ionescu/apache-spark,holdenk/spark,ibm-research-ireland/sparkoscope,kissmetrics/spark,alunarbeach/spark,actuaryzhang/spark,jkbradley/spark,rekhajoshm/spark,lxsmnv/spark,adrian-ionescu/apache-spark,janewangfb/spark,caneGuy/spark,jrshust/spark,rikima/spark,chuckchen/spark,yanboliang/spark,metamx/spark,MLnick/spark,matthewfranglen/spark