[DOCS] Update docs to not suggest to package Spark before running tests.
[DOCS] Update docs to not suggest to package Spark before running tests.

## What changes were proposed in this pull request?

Update docs to not suggest to package Spark before running tests.

## How was this patch tested?

Not creating a JIRA since this pretty small. We haven't had the need to run mvn package before mvn test since 1.6 at least, or so I am told. So, updating the docs to not be misguiding.

Author: Mark Grover <mark@apache.org>

Closes #15572 from markgrover/doc_update.

esi-mineset/spark,someorz/spark,sureshthalamati/spark,Aegeaner/spark,mahak/spark,holdenk/spark,zhouyejoe/spark,lvdongr/spark,debugger87/spark,dhruve/spark,ahnqirage/spark,ibm-research-ireland/sparkoscope,rikima/spark,ajaysaini725/spark,rekhajoshm/spark,dhruve/spark,sahilTakiar/spark,saltstar/spark,bOOm-X/spark,1haodian/spark,mzl9039/spark,zhouyejoe/spark,skonto/spark,markhamstra/spark,guoxiaolongzte/spark,jrshust/spark,MLnick/spark,adrian-ionescu/apache-spark,witgo/spark,poffuomo/spark,ioana-delaney/spark,bdrillard/spark,kiszk/spark,minixalpha/spark,dongjoon-hyun/spark,shuangshuangwang/spark,jianran/spark,zero323/spark,ron8hu/spark,tejasapatil/spark,mahak/spark,wangmiao1981/spark,HyukjinKwon/spark,akopich/spark,aokolnychyi/spark,debugger87/spark,publicRoman/spark,milliman/spark,bdrillard/spark,sahilTakiar/spark,aosagie/spark,someorz/spark,ueshin/apache-spark,caneGuy/spark,saturday-shi/spark,bdrillard/spark,taroplus/spark,mike0sv/spark,michalsenkyr/spark,cin/spark,hhbyyh/spark,UndeadBaneGitHub/spark,bravo-zhang/spark,milliman/spark,icexelloss/spark,LantaoJin/spark,bdrillard/spark,michalsenkyr/spark,metamx/spark,MLnick/spark,saltstar/spark,jiangxb1987/spark,setjet/spark,zhouyejoe/spark,Panos-Bletsos/spark-cost-model-optimizer,wangyum/spark,debugger87/spark,pgandhi999/spark,kissmetrics/spark,esi-mineset/spark,apache/spark,ptkool/spark,techaddict/spark,vinodkc/spark,JoshRosen/spark,bravo-zhang/spark,darionyaphet/spark,metamx/spark,panfengfeng/spark,nchammas/spark,JoshRosen/spark,BryanCutler/spark,Panos-Bletsos/spark-cost-model-optimizer,jlopezmalla/spark,maropu/spark,jiangxb1987/spark,holdenk/spark,saturday-shi/spark,xflin/spark,aosagie/spark,brad-kaiser/spark,saltstar/spark,Aegeaner/spark,shubhamchopra/spark,bOOm-X/spark,cin/spark,Aegeaner/spark,srowen/spark,kimoonkim/spark,shuangshuangwang/spark,rekhajoshm/spark,JerryLead/spark,sureshthalamati/spark,janewangfb/spark,xuanyuanking/spark,darionyaphet/spark,brad-kaiser/spark,eyalfa/spark,dbtsai/spark,markhamstra/spark,techaddict/spark,facaiy/spark,debugger87/spark,patrick-nicholson/spark,someorz/spark,huang1900/spark,icexelloss/spark,liutang123/spark,nchammas/spark,rednaxelafx/apache-spark,narahari92/spark,rekhajoshm/spark,highfei2011/spark,byakuinss/spark,publicRoman/spark,kevinyu98/spark,gengliangwang/spark,nilsgrabbert/spark,poffuomo/spark,narahari92/spark,big-pegasus/spark,caneGuy/spark,SHASHANKB/spark,kiszk/spark,liyichao/spark,UndeadBaneGitHub/spark,hhbyyh/spark,tengpeng/spark,brad-kaiser/spark,panfengfeng/spark,szhem/spark,mike0sv/spark,lvdongr/spark,wangmiao1981/spark,mdespriee/spark,ConeyLiu/spark,rezasafi/spark,map222/spark,HyukjinKwon/spark,srowen/spark,jiangxb1987/spark,patrick-nicholson/spark,shubhamchopra/spark,eyalfa/spark,ibm-research-ireland/sparkoscope,liyichao/spark,minixalpha/spark,saturday-shi/spark,actuaryzhang/spark,loneknightpy/spark,jianran/spark,tejasapatil/spark,huang1900/spark,saturday-shi/spark,markhamstra/spark,wangmiao1981/spark,goldmedal/spark,pgandhi999/spark,caneGuy/spark,loneknightpy/spark,taroplus/spark,techaddict/spark,loneknightpy/spark,aokolnychyi/spark,jlopezmalla/spark,aokolnychyi/spark,ajaysaini725/spark,ericvandenbergfb/spark,sachintyagi22/spark,lvdongr/spark,liyichao/spark,ibm-research-ireland/sparkoscope,WindCanDie/spark,aokolnychyi/spark,spark-test/spark,map222/spark,szhem/spark,adrian-ionescu/apache-spark,byakuinss/spark,mike0sv/spark,WeichenXu123/spark,minixalpha/spark,zuotingbing/spark,eyalfa/spark,JerryLead/spark,1haodian/spark,dongjoon-hyun/spark,caneGuy/spark,highfei2011/spark,setjet/spark,SnappyDataInc/spark,holdenk/spark,zuotingbing/spark,poffuomo/spark,rednaxelafx/apache-spark,michalsenkyr/spark,hvanhovell/spark,JoshRosen/spark,ibm-research-ireland/sparkoscope,SnappyDataInc/spark,apache-spark-on-k8s/spark,byakuinss/spark,cin/spark,cin/spark,sahilTakiar/spark,BryanCutler/spark,gengliangwang/spark,1haodian/spark,janewangfb/spark,minixalpha/spark,hhbyyh/spark,sahilTakiar/spark,liutang123/spark,joseph-torres/spark,liyichao/spark,hvanhovell/spark,zhouyejoe/spark,mike0sv/spark,nlalevee/spark,cloud-fan/spark,jkbradley/spark,zuotingbing/spark,jlopezmalla/spark,lxsmnv/spark,wangyum/spark,szhem/spark,shuangshuangwang/spark,ueshin/apache-spark,ajaysaini725/spark,publicRoman/spark,wangyum/spark,zhouyejoe/spark,janewangfb/spark,lvdongr/spark,Panos-Bletsos/spark-cost-model-optimizer,kissmetrics/spark,aokolnychyi/spark,hvanhovell/spark,wangmiao1981/spark,narahari92/spark,LantaoJin/spark,adrian-ionescu/apache-spark,apache/spark,ptkool/spark,yanboliang/spark,cloud-fan/spark,narahari92/spark,Panos-Bletsos/spark-cost-model-optimizer,chuckchen/spark,ron8hu/spark,chuckchen/spark,Aegeaner/spark,xflin/spark,panfengfeng/spark,hhbyyh/spark,bOOm-X/spark,akopich/spark,stanzhai/spark,setjet/spark,eyalfa/spark,dongjoon-hyun/spark,mahak/spark,xuanyuanking/spark,metamx/spark,jiangxb1987/spark,hhbyyh/spark,kevinyu98/spark,vinodkc/spark,xuanyuanking/spark,icexelloss/spark,techaddict/spark,jkbradley/spark,shaneknapp/spark,wzhfy/spark,kissmetr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