[SPARK-8395] [DOCS] start-slave.sh docs incorrect
[SPARK-8395] [DOCS] start-slave.sh docs incorrect

start-slave.sh no longer takes a worker # param in 1.4+

Author: Sean Owen <sowen@cloudera.com>

Closes #6855 from srowen/SPARK-8395 and squashes the following commits:

300278e [Sean Owen] start-slave.sh no longer takes a worker # param in 1.4+

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