[SPARK-18705][ML][DOC] Update user guide to reflect one pass solver for L1 and elastic-net
[SPARK-18705][ML][DOC] Update user guide to reflect one pass solver for L1 and elastic-net

## What changes were proposed in this pull request?

WeightedLeastSquares now supports L1 and elastic net penalties and has an additional solver option: QuasiNewton. The docs are updated to reflect this change.

## How was this patch tested?

Docs only. Generated documentation to make sure Latex looks ok.

Author: sethah <seth.hendrickson16@gmail.com>

Closes #16139 from sethah/SPARK-18705.

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