[MLlib][SPARK-2997] Update SVD documentation to reflect roughly square
[MLlib][SPARK-2997] Update SVD documentation to reflect roughly square

Update the documentation to reflect the fact we can handle roughly square matrices.

Author: Reza Zadeh <rizlar@gmail.com>

Closes #2070 from rezazadeh/svddocs and squashes the following commits:

826b8fe [Reza Zadeh] left singular vectors
3f34fc6 [Reza Zadeh] PCA is still TS
7ffa2aa [Reza Zadeh] better title
aeaf39d [Reza Zadeh] More docs
788ed13 [Reza Zadeh] add computational cost explanation
6429c59 [Reza Zadeh] Add link to rowmatrix docs
1eeab8b [Reza Zadeh] Update SVD documentation to reflect roughly square

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