Update unix-test-instructions.md
Update unix-test-instructions.md

Add quotes around coreFxBinDir in unix-test-instructions document.
krk/coreclr,alexperovich/coreclr,shahid-pk/coreclr,wateret/coreclr,neurospeech/coreclr,JonHanna/coreclr,tijoytom/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,yeaicc/coreclr,cydhaselton/coreclr,poizan42/coreclr,bartdesmet/coreclr,schellap/coreclr,roncain/coreclr,KrzysztofCwalina/coreclr,LLITCHEV/coreclr,wateret/coreclr,dasMulli/coreclr,ruben-ayrapetyan/coreclr,dpodder/coreclr,parjong/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,jamesqo/coreclr,cshung/coreclr,martinwoodward/coreclr,manu-silicon/coreclr,yeaicc/coreclr,jamesqo/coreclr,Dmitry-Me/coreclr,gkhanna79/coreclr,dasMulli/coreclr,cmckinsey/coreclr,dpodder/coreclr,josteink/coreclr,JonHanna/coreclr,mmitche/coreclr,cmckinsey/coreclr,James-Ko/coreclr,Dmitry-Me/coreclr,LLITCHEV/coreclr,ramarag/coreclr,mmitche/coreclr,naamunds/coreclr,cydhaselton/coreclr,bartdesmet/coreclr,botaberg/coreclr,KrzysztofCwalina/coreclr,qiudesong/coreclr,schellap/coreclr,bartdesmet/coreclr,James-Ko/coreclr,Dmitry-Me/coreclr,sagood/coreclr,bartdesmet/coreclr,bartdesmet/coreclr,hseok-oh/coreclr,yizhang82/coreclr,vinnyrom/coreclr,kyulee1/coreclr,neurospeech/coreclr,jamesqo/coreclr,roncain/coreclr,yizhang82/coreclr,parjong/coreclr,naamunds/coreclr,sagood/coreclr,shahid-pk/coreclr,cydhaselton/coreclr,wtgodbe/coreclr,KrzysztofCwalina/coreclr,pgavlin/coreclr,kyulee1/coreclr,AlexGhiondea/coreclr,qiudesong/coreclr,neurospeech/coreclr,YongseopKim/coreclr,russellhadley/coreclr,krk/coreclr,tijoytom/coreclr,rartemev/coreclr,sjsinju/coreclr,mskvortsov/coreclr,ramarag/coreclr,krytarowski/coreclr,mskvortsov/coreclr,martinwoodward/coreclr,neurospeech/coreclr,roncain/coreclr,mskvortsov/coreclr,krytarowski/coreclr,hseok-oh/coreclr,LLITCHEV/coreclr,ramarag/coreclr,manu-silicon/coreclr,qiudesong/coreclr,martinwoodward/coreclr,pgavlin/coreclr,sagood/coreclr,poizan42/coreclr,cmckinsey/coreclr,rartemev/coreclr,botaberg/coreclr,KrzysztofCwalina/coreclr,vinnyrom/coreclr,LLITCHEV/coreclr,jamesqo/coreclr,ZhichengZhu/coreclr,botaberg/coreclr,hseok-oh/coreclr,JonHanna/coreclr,jamesqo/coreclr,tijoytom/coreclr,krytarowski/coreclr,krytarowski/coreclr,poizan42/coreclr,tijoytom/coreclr,krytarowski/coreclr,vinnyrom/coreclr,yizhang82/coreclr,ragmani/coreclr,dasMulli/coreclr,shahid-pk/coreclr,shahid-pk/coreclr,shahid-pk/coreclr,LLITCHEV/coreclr,cshung/coreclr,krk/coreclr,schellap/coreclr,dpodder/coreclr,poizan42/coreclr,krk/coreclr,alexperovich/coreclr,qiudesong/coreclr,mmitche/coreclr,ragmani/coreclr,YongseopKim/coreclr,botaberg/coreclr,alexperovich/coreclr,kyulee1/coreclr,kyulee1/coreclr,sjsinju/coreclr,yizhang82/coreclr,cmckinsey/coreclr,Dmitry-Me/coreclr,schellap/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,parjong/coreclr,cmckinsey/coreclr,parjong/coreclr,jhendrixMSFT/coreclr,naamunds/coreclr,JosephTremoulet/coreclr,yeaicc/coreclr,ramarag/coreclr,alexperovich/coreclr,neurospeech/coreclr,manu-silicon/coreclr,wtgodbe/coreclr,pgavlin/coreclr,alexperovich/coreclr,cydhaselton/coreclr,wateret/coreclr,AlexGhiondea/coreclr,JonHanna/coreclr,ragmani/coreclr,YongseopKim/coreclr,krk/coreclr,bartdesmet/coreclr,Dmitry-Me/coreclr,KrzysztofCwalina/coreclr,wtgodbe/coreclr,ZhichengZhu/coreclr,JonHanna/coreclr,poizan42/coreclr,hseok-oh/coreclr,James-Ko/coreclr,jhendrixMSFT/coreclr,neurospeech/coreclr,cmckinsey/coreclr,vinnyrom/coreclr,jhendrixMSFT/coreclr,rartemev/coreclr,jhendrixMSFT/coreclr,alexperovich/coreclr,JosephTremoulet/coreclr,naamunds/coreclr,AlexGhiondea/coreclr,kyulee1/coreclr,tijoytom/coreclr,botaberg/coreclr,josteink/coreclr,YongseopKim/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,gkhanna79/coreclr,roncain/coreclr,wateret/coreclr,schellap/coreclr,James-Ko/coreclr,jhendrixMSFT/coreclr,naamunds/coreclr,josteink/coreclr,parjong/coreclr,sjsinju/coreclr,mmitche/coreclr,hseok-oh/coreclr,martinwoodward/coreclr,manu-silicon/coreclr,cshung/coreclr,ragmani/coreclr,roncain/coreclr,James-Ko/coreclr,cydhaselton/coreclr,manu-silicon/coreclr,qiudesong/coreclr,shahid-pk/coreclr,tijoytom/coreclr,dpodder/coreclr,JosephTremoulet/coreclr,mskvortsov/coreclr,russellhadley/coreclr,mmitche/coreclr,roncain/coreclr,ZhichengZhu/coreclr,cshung/coreclr,schellap/coreclr,russellhadley/coreclr,roncain/coreclr,JosephTremoulet/coreclr,gkhanna79/coreclr,sagood/coreclr,Dmitry-Me/coreclr,ruben-ayrapetyan/coreclr,rartemev/coreclr,cmckinsey/coreclr,JosephTremoulet/coreclr,josteink/coreclr,sagood/coreclr,naamunds/coreclr,shahid-pk/coreclr,sjsinju/coreclr,jhendrixMSFT/coreclr,dasMulli/coreclr,ZhichengZhu/coreclr,sagood/coreclr,yeaicc/coreclr,ZhichengZhu/coreclr,dpodder/coreclr,dasMulli/coreclr,JonHanna/coreclr,Dmitry-Me/coreclr,mmitche/coreclr,yeaicc/coreclr,dpodder/coreclr,ragmani/coreclr,naamunds/coreclr,wtgodbe/coreclr,josteink/coreclr,mskvortsov/coreclr,manu-silicon/coreclr,ruben-ayrapetyan/coreclr,YongseopKim/coreclr,kyulee1/coreclr,vinnyrom/coreclr,cydhaselton/coreclr,pgavlin/coreclr,cshung/coreclr,dasMulli/coreclr,josteink/coreclr,martinwoodward/coreclr,cshung/coreclr,rartemev/coreclr,bartdesmet/coreclr,krytarowski/coreclr,AlexGhiondea/coreclr,ZhichengZhu/coreclr,KrzysztofCwalina/coreclr,gkhanna79/coreclr,rartemev/coreclr,wateret/coreclr,martinwoodward/coreclr,LLITCHEV/coreclr,vinnyrom/coreclr,poizan42/coreclr,russellhadley/coreclr,martinwoodward/coreclr,hseok-oh/coreclr,dasMulli/coreclr,gkhanna79/coreclr,russellhadley/coreclr,ZhichengZhu/coreclr,ramarag/coreclr,yizhang82/coreclr,vinnyrom/coreclr,gkhanna79/coreclr,botaberg/coreclr,wateret/coreclr,yeaicc/coreclr,pgavlin/coreclr,sjsinju/coreclr,qiudesong/coreclr,AlexGhiondea/coreclr,LLITCHEV/coreclr,mskvortsov/coreclr,yizhang82/coreclr,jhendrixMSFT/coreclr,YongseopKim/coreclr,wtgodbe/coreclr,manu-silicon/coreclr,russellhadley/coreclr,ramarag/coreclr,sjsinju/coreclr,schellap/coreclr,ramarag/coreclr,ragmani/coreclr,krk/coreclr,pgavlin/coreclr,yeaicc/coreclr,wtgodbe/coreclr,josteink/coreclr,KrzysztofCwalina/coreclr