[MINOR] Minor comment fixes in merge_spark_pr.py script
[MINOR] Minor comment fixes in merge_spark_pr.py script

## What changes were proposed in this pull request?

This PR proposes to fix few rather typos in `merge_spark_pr.py`.

- `#   usage: ./apache-pr-merge.py    (see config env vars below)`
  -> `#   usage: ./merge_spark_pr.py    (see config env vars below)`

- `... have local a Spark ...` -> `... have a local Spark ...`

- `... to Apache.` -> `... to Apache Spark.`

I skimmed this file and these look all I could find.

## How was this patch tested?

pep8 check (`./dev/lint-python`).

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #18776 from HyukjinKwon/minor-merge-script.

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