[SPARK-17718][DOCS][MLLIB] Make loss function formulation label note clearer in MLlib docs
[SPARK-17718][DOCS][MLLIB] Make loss function formulation label note clearer in MLlib docs

## What changes were proposed in this pull request?

Move note about labels being +1/-1 in formulation only to be just under the table of formulations.

## How was this patch tested?

Doc build

Author: Sean Owen <sowen@cloudera.com>

Closes #15330 from srowen/SPARK-17718.

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