Fix typos and grammer in coreclr README.md (#8561)
Fix typos and grammer in coreclr README.md (#8561)

* Fix typeos and grammer in README.md

* Fix a small grammar issue and remove a comma

cmckinsey/coreclr,mmitche/coreclr,rartemev/coreclr,tijoytom/coreclr,sagood/coreclr,sagood/coreclr,sagood/coreclr,cmckinsey/coreclr,ragmani/coreclr,dpodder/coreclr,hseok-oh/coreclr,rartemev/coreclr,JosephTremoulet/coreclr,James-Ko/coreclr,krk/coreclr,sjsinju/coreclr,wtgodbe/coreclr,jamesqo/coreclr,James-Ko/coreclr,krytarowski/coreclr,AlexGhiondea/coreclr,krk/coreclr,cydhaselton/coreclr,krk/coreclr,botaberg/coreclr,sjsinju/coreclr,hseok-oh/coreclr,gkhanna79/coreclr,cshung/coreclr,dpodder/coreclr,krk/coreclr,YongseopKim/coreclr,qiudesong/coreclr,kyulee1/coreclr,yeaicc/coreclr,wateret/coreclr,ragmani/coreclr,parjong/coreclr,gkhanna79/coreclr,alexperovich/coreclr,JosephTremoulet/coreclr,JonHanna/coreclr,poizan42/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,mmitche/coreclr,dpodder/coreclr,rartemev/coreclr,gkhanna79/coreclr,tijoytom/coreclr,botaberg/coreclr,yizhang82/coreclr,yizhang82/coreclr,alexperovich/coreclr,poizan42/coreclr,yizhang82/coreclr,sjsinju/coreclr,pgavlin/coreclr,dpodder/coreclr,poizan42/coreclr,rartemev/coreclr,YongseopKim/coreclr,wateret/coreclr,cshung/coreclr,James-Ko/coreclr,JosephTremoulet/coreclr,AlexGhiondea/coreclr,pgavlin/coreclr,tijoytom/coreclr,krytarowski/coreclr,botaberg/coreclr,cydhaselton/coreclr,AlexGhiondea/coreclr,botaberg/coreclr,yizhang82/coreclr,wtgodbe/coreclr,yeaicc/coreclr,hseok-oh/coreclr,wateret/coreclr,russellhadley/coreclr,ragmani/coreclr,AlexGhiondea/coreclr,russellhadley/coreclr,jamesqo/coreclr,pgavlin/coreclr,jamesqo/coreclr,wateret/coreclr,sagood/coreclr,wateret/coreclr,krytarowski/coreclr,cmckinsey/coreclr,botaberg/coreclr,JonHanna/coreclr,rartemev/coreclr,qiudesong/coreclr,poizan42/coreclr,ragmani/coreclr,mskvortsov/coreclr,gkhanna79/coreclr,kyulee1/coreclr,poizan42/coreclr,YongseopKim/coreclr,cshung/coreclr,botaberg/coreclr,yeaicc/coreclr,russellhadley/coreclr,James-Ko/coreclr,cydhaselton/coreclr,russellhadley/coreclr,russellhadley/coreclr,cmckinsey/coreclr,tijoytom/coreclr,ruben-ayrapetyan/coreclr,sagood/coreclr,gkhanna79/coreclr,jamesqo/coreclr,jamesqo/coreclr,cydhaselton/coreclr,cydhaselton/coreclr,James-Ko/coreclr,mskvortsov/coreclr,JonHanna/coreclr,alexperovich/coreclr,sjsinju/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,YongseopKim/coreclr,YongseopKim/coreclr,qiudesong/coreclr,ragmani/coreclr,cmckinsey/coreclr,neurospeech/coreclr,qiudesong/coreclr,cmckinsey/coreclr,wtgodbe/coreclr,sjsinju/coreclr,mskvortsov/coreclr,mskvortsov/coreclr,AlexGhiondea/coreclr,parjong/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,James-Ko/coreclr,mmitche/coreclr,krk/coreclr,neurospeech/coreclr,hseok-oh/coreclr,alexperovich/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,parjong/coreclr,yizhang82/coreclr,cshung/coreclr,ragmani/coreclr,gkhanna79/coreclr,sjsinju/coreclr,mmitche/coreclr,yeaicc/coreclr,parjong/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,qiudesong/coreclr,pgavlin/coreclr,dpodder/coreclr,qiudesong/coreclr,cydhaselton/coreclr,krytarowski/coreclr,poizan42/coreclr,hseok-oh/coreclr,mskvortsov/coreclr,neurospeech/coreclr,neurospeech/coreclr,alexperovich/coreclr,yizhang82/coreclr,wtgodbe/coreclr,YongseopKim/coreclr,krytarowski/coreclr,pgavlin/coreclr,parjong/coreclr,JonHanna/coreclr,mskvortsov/coreclr,krk/coreclr,jamesqo/coreclr,mmitche/coreclr,krytarowski/coreclr,ruben-ayrapetyan/coreclr,cshung/coreclr,tijoytom/coreclr,tijoytom/coreclr,JonHanna/coreclr,hseok-oh/coreclr,cshung/coreclr,pgavlin/coreclr,russellhadley/coreclr,yeaicc/coreclr,kyulee1/coreclr,AlexGhiondea/coreclr,kyulee1/coreclr,cmckinsey/coreclr,JonHanna/coreclr,dpodder/coreclr,yeaicc/coreclr,sagood/coreclr,wateret/coreclr,kyulee1/coreclr,ruben-ayrapetyan/coreclr,rartemev/coreclr,kyulee1/coreclr,alexperovich/coreclr,yeaicc/coreclr,mmitche/coreclr,neurospeech/coreclr