[SPARK-5254][MLLIB] remove developers section from spark.ml guide
[SPARK-5254][MLLIB] remove developers section from spark.ml guide

Forgot to remove this section in #4052.

Author: Xiangrui Meng <meng@databricks.com>

Closes #4053 from mengxr/SPARK-5254-update and squashes the following commits:

f295bde [Xiangrui Meng] remove developers section from spark.ml guide

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