[SPARK-5958][MLLIB][DOC] update block matrix user guide
[SPARK-5958][MLLIB][DOC] update block matrix user guide

* Removed SVD code from examples.
* Corrected Java API doc link.
* Updated variable names: `AtransposeA` -> `ata`.
* Minor changes.

brkyvz

Author: Xiangrui Meng <meng@databricks.com>

Closes #4737 from mengxr/update-block-matrix-user-guide and squashes the following commits:

70f53ac [Xiangrui Meng] update block matrix user guide

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