[SPARK-21615][ML][MLLIB][DOCS] Fix broken redirect in collaborative filtering docs to databricks training repo
[SPARK-21615][ML][MLLIB][DOCS] Fix broken redirect in collaborative filtering docs to databricks training repo

## What changes were proposed in this pull request?
* Current [MLlib Collaborative Filtering tutorial](https://spark.apache.org/docs/latest/mllib-collaborative-filtering.html) points to broken links to old databricks website.
* Databricks moved all their content to [git repo](https://github.com/databricks/spark-training)
* Two links needs to be fixed,
  * [training exercises](https://databricks-training.s3.amazonaws.com/index.html)
  * [personalized movie recommendation with spark.mllib](https://databricks-training.s3.amazonaws.com/movie-recommendation-with-mllib.html)

## How was this patch tested?
Generated docs locally

Author: Ayush Singh <singhay@ccs.neu.edu>

Closes #18821 from singhay/SPARK-21615.

skonto/spark,rednaxelafx/apache-spark,dongjoon-hyun/spark,shuangshuangwang/spark,ioana-delaney/spark,jiangxb1987/spark,ron8hu/spark,zero323/spark,ptkool/spark,nlalevee/spark,stanzhai/spark,hvanhovell/spark,ajaysaini725/spark,markhamstra/spark,icexelloss/spark,mahak/spark,joseph-torres/spark,narahari92/spark,sahilTakiar/spark,kevinyu98/spark,bdrillard/spark,guoxiaolongzte/spark,zero323/spark,mike0sv/spark,bravo-zhang/spark,lxsmnv/spark,shubhamchopra/spark,stanzhai/spark,brad-kaiser/spark,zuotingbing/spark,szhem/spark,WeichenXu123/spark,janewangfb/spark,aray/spark,nlalevee/spark,jkbradley/spark,rikima/spark,bravo-zhang/spark,maropu/spark,SHASHANKB/spark,UndeadBaneGitHub/spark,hvanhovell/spark,holdenk/spark,shaneknapp/spark,rednaxelafx/apache-spark,guoxiaolongzte/spark,eyalfa/spark,someorz/spark,kevinyu98/spark,LantaoJin/spark,maropu/spark,goldmedal/spark,wangyum/spark,SHASHANKB/spark,byakuinss/spark,facaiy/spark,BryanCutler/spark,minixalpha/spark,wzhfy/spark,bravo-zhang/spark,yanboliang/spark,BryanCutler/spark,HyukjinKwon/spark,1haodian/spark,nchammas/spark,srowen/spark,kevinyu98/spark,szhem/spark,xflin/spark,maropu/spark,kiszk/spark,WeichenXu123/spark,adrian-ionescu/apache-spark,milliman/spark,saltstar/spark,dongjoon-hyun/spark,tejasapatil/spark,szhem/spark,hvanhovell/spark,1haodian/spark,sahilTakiar/spark,highfei2011/spark,aray/spark,JoshRosen/spark,sureshthalamati/spark,eyalfa/spark,apache/spark,brad-kaiser/spark,eyalfa/spark,xflin/spark,tejasapatil/spark,techaddict/spark,highfei2011/spark,adrian-ionescu/apache-spark,ConeyLiu/spark,mike0sv/spark,hhbyyh/spark,sahilTakiar/spark,goldmedal/spark,minixalpha/spark,Aegeaner/spark,cloud-fan/spark,yanboliang/spark,lvdongr/spark,zzcclp/spark,byakuinss/spark,ericvandenbergfb/spark,sureshthalamati/spark,minixalpha/spark,aray/spark,srowen/spark,szhem/spark,yanboliang/spark,ddna1021/spark,rezasafi/spark,wzhfy/spark,ahnqirage/spark,mahak/spark,nlalevee/spark,rezasafi/spark,skonto/spark,shubhamchopra/spark,HyukjinKwon/spark,LantaoJin/spark,debugger87/spark,kevinyu98/spark,ioana-delaney/spark,techaddict/spark,caneGuy/spark,zero323/spark,vinodkc/spark,spark-test/spark,srowen/spark,alunarbeach/spark,lxsmnv/spark,dongjoon-hyun/spark,ueshin/apache-spark,BryanCutler/spark,michalsenkyr/spark,caneGuy/spark,ajaysaini725/spark,dbtsai/spark,kiszk/spark,highfei2011/spark,saltstar/spark,debugger87/spark,ron8hu/spark,michalsenkyr/spark,shubhamchopra/spark,akopich/spark,nchammas/spark,eyalfa/spark,JoshRosen/spark,yanboliang/spark,xuanyuanking/spark,holdenk/spark,jiangxb1987/spark,dbtsai/spark,shaneknapp/spark,esi-mineset/spark,mike0sv/spark,bdrillard/spark,mahak/spark,esi-mineset/spark,rednaxelafx/apache-spark,nlalevee/spark,UndeadBaneGitHub/spark,dbtsai/spark,ptkool/spark,actuaryzhang/spark,cin/spark,aosagie/spark,lvdongr/spark,zhouyejoe/spark,hhbyyh/spark,HyukjinKwon/spark,1haodian/spark,apache/spark,ajaysaini725/spark,ioana-delaney/spark,saltstar/spark,ioana-delaney/spark,LantaoJin/spark,byakuinss/spark,kiszk/spark,icexelloss/spark,goldmedal/spark,witgo/spark,LantaoJin/spark,taroplus/spark,tejasapatil/spark,markhamstra/spark,janewangfb/spark,stanzhai/spark,spark-test/spark,dbtsai/spark,WindCanDie/spark,zhouyejoe/spark,wangyum/spark,esi-mineset/spark,rekhajoshm/spark,sureshthalamati/spark,cin/spark,brad-kaiser/spark,aosagie/spark,brad-kaiser/spark,Aegeaner/spark,tengpeng/spark,skonto/spark,WindCanDie/spark,milliman/spark,goldmedal/spark,wangmiao1981/spark,tengpeng/spark,ahnqirage/spark,mike0sv/spark,zzcclp/spark,facaiy/spark,milliman/spark,icexelloss/spark,sahilTakiar/spark,WindCanDie/spark,sahilTakiar/spark,hhbyyh/spark,icexelloss/spark,someorz/spark,shubhamchopra/spark,ericvandenbergfb/spark,ConeyLiu/spark,akopich/spark,byakuinss/spark,rekhajoshm/spark,akopich/spark,darionyaphet/spark,someorz/spark,taroplus/spark,yanboliang/spark,spark-test/spark,milliman/spark,aray/spark,eyalfa/spark,akopich/spark,aosagie/spark,WeichenXu123/spark,debugger87/spark,zuotingbing/spark,ConeyLiu/spark,rekhajoshm/spark,akopich/spark,alunarbeach/spark,dongjoon-hyun/spark,ahnqirage/spark,holdenk/spark,WeichenXu123/spark,bravo-zhang/spark,zzcclp/spark,BryanCutler/spark,taroplus/spark,rikima/spark,dbtsai/spark,ddna1021/spark,witgo/spark,caneGuy/spark,xuanyuanking/spark,WeichenXu123/spark,ajaysaini725/spark,xuanyuanking/spark,caneGuy/spark,facaiy/spark,guoxiaolongzte/spark,tejasapatil/spark,lxsmnv/spark,adrian-ionescu/apache-spark,ahnqirage/spark,sahilTakiar/spark,esi-mineset/spark,Aegeaner/spark,ajaysaini725/spark,apache/spark,pgandhi999/spark,ajaysaini725/spark,kevinyu98/spark,goldmedal/spark,michalsenkyr/spark,minixalpha/spark,xuanyuanking/spark,UndeadBaneGitHub/spark,brad-kaiser/spark,gengliangwang/spark,shuangshuangwang/spark,ericvandenbergfb/spark,bdrillard/spark,zuotingbing/spark,alunarbeach/spark,ajaysaini725/spark,highfei2011/spark,xflin/spark,minixalpha/spark,kiszk/spark,JoshRosen/spark,actuaryzhang/spark,pgandhi999/spark,guoxiaolongzte/spark,ddna1021/spark,skonto/spark,shubhamchopra/spark,aray/spark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