Added what NGEN stands for.
Added what NGEN stands for.

https://github.com/dotnet/corefx/pull/5760#discussion_r51316097
cartermp/corefx,khdang/corefx,marksmeltzer/corefx,zhenlan/corefx,benpye/corefx,janhenke/corefx,DnlHarvey/corefx,stephenmichaelf/corefx,JosephTremoulet/corefx,gkhanna79/corefx,alphonsekurian/corefx,shimingsg/corefx,marksmeltzer/corefx,khdang/corefx,janhenke/corefx,manu-silicon/corefx,weltkante/corefx,ViktorHofer/corefx,pallavit/corefx,the-dwyer/corefx,mokchhya/corefx,krytarowski/corefx,mafiya69/corefx,Priya91/corefx-1,nchikanov/corefx,khdang/corefx,stephenmichaelf/corefx,pallavit/corefx,Jiayili1/corefx,YoupHulsebos/corefx,zhenlan/corefx,dotnet-bot/corefx,stephenmichaelf/corefx,alphonsekurian/corefx,lggomez/corefx,MaggieTsang/corefx,mazong1123/corefx,nbarbettini/corefx,kkurni/corefx,zhenlan/corefx,pallavit/corefx,jcme/corefx,parjong/corefx,stone-li/corefx,mazong1123/corefx,BrennanConroy/corefx,Petermarcu/corefx,adamralph/corefx,ravimeda/corefx,JosephTremoulet/corefx,krytarowski/corefx,twsouthwick/corefx,billwert/corefx,Ermiar/corefx,jlin177/corefx,nbarbettini/corefx,elijah6/corefx,manu-silicon/corefx,YoupHulsebos/corefx,krytarowski/corefx,axelheer/corefx,kkurni/corefx,jcme/corefx,Priya91/corefx-1,dhoehna/corefx,billwert/corefx,Jiayili1/corefx,yizhang82/corefx,stephenmichaelf/corefx,lggomez/corefx,richlander/corefx,JosephTremoulet/corefx,richlander/corefx,the-dwyer/corefx,mmitche/corefx,rjxby/corefx,alphonsekurian/corefx,jlin177/corefx,elijah6/corefx,richlander/corefx,shmao/corefx,billwert/corefx,rjxby/corefx,zhenlan/corefx,ericstj/corefx,tijoytom/corefx,cydhaselton/corefx,tijoytom/corefx,Petermarcu/corefx,twsouthwick/corefx,YoupHulsebos/corefx,rubo/corefx,wtgodbe/corefx,jhendrixMSFT/corefx,parjong/corefx,MaggieTsang/corefx,adamralph/corefx,rahku/corefx,krytarowski/corefx,wtgodbe/corefx,Priya91/corefx-1,axelheer/corefx,rjxby/corefx,alexperovich/corefx,manu-silicon/corefx,mazong1123/corefx,rahku/corefx,alexperovich/corefx,fgreinacher/corefx,shmao/corefx,the-dwyer/corefx,Priya91/corefx-1,yizhang82/corefx,cartermp/corefx,mokchhya/corefx,iamjasonp/corefx,richlander/corefx,weltkante/corefx,seanshpark/corefx,dsplaisted/corefx,lggomez/corefx,seanshpark/corefx,manu-silicon/corefx,the-dwyer/corefx,cartermp/corefx,benjamin-bader/corefx,ellismg/corefx,Jiayili1/corefx,parjong/corefx,jhendrixMSFT/corefx,ViktorHofer/corefx,alexperovich/corefx,mmitche/corefx,Chrisboh/corefx,rahku/corefx,benpye/corefx,dhoehna/corefx,manu-silicon/corefx,khdang/corefx,Jiayili1/corefx,rjxby/corefx,lggomez/corefx,Jiayili1/corefx,JosephTremoulet/corefx,ericstj/corefx,SGuyGe/corefx,twsouthwick/corefx,cydhaselton/corefx,tstringer/corefx,Ermiar/corefx,stephenmichaelf/corefx,iamjasonp/corefx,SGuyGe/corefx,ptoonen/corefx,lggomez/corefx,ptoonen/corefx,kkurni/corefx,lggomez/corefx,nbarbettini/corefx,seanshpark/corefx,wtgodbe/corefx,tstringer/corefx,wtgodbe/corefx,krk/corefx,stone-li/corefx,marksmeltzer/corefx,janhenke/corefx,axelheer/corefx,dotnet-bot/corefx,the-dwyer/corefx,ellismg/corefx,ViktorHofer/corefx,dotnet-bot/corefx,mmitche/corefx,rubo/corefx,elijah6/corefx,benpye/corefx,zhenlan/corefx,the-dwyer/corefx,Chrisboh/corefx,DnlHarvey/corefx,Petermarcu/corefx,gkhanna79/corefx,marksmeltzer/corefx,cydhaselton/corefx,billwert/corefx,the-dwyer/corefx,seanshpark/corefx,nchikanov/corefx,mafiya69/corefx,dotnet-bot/corefx,mmitche/corefx,nchikanov/corefx,ravimeda/corefx,jcme/corefx,shimingsg/corefx,Ermiar/corefx,wtgodbe/corefx,elijah6/corefx,shmao/corefx,mmitche/corefx,Ermiar/corefx,mmitche/corefx,shahid-pk/corefx,rjxby/corefx,MaggieTsang/corefx,SGuyGe/corefx,weltkante/corefx,alexperovich/corefx,ericstj/corefx,weltkante/corefx,parjong/corefx,benjamin-bader/corefx,shahid-pk/corefx,fgreinacher/corefx,stone-li/corefx,tstringer/corefx,adamralph/corefx,jlin177/corefx,krytarowski/corefx,mazong1123/corefx,ellismg/corefx,cartermp/corefx,mafiya69/corefx,Priya91/corefx-1,marksmeltzer/corefx,mafiya69/corefx,YoupHulsebos/corefx,krk/corefx,weltkante/corefx,nchikanov/corefx,mazong1123/corefx,shmao/corefx,nchikanov/corefx,krytarowski/corefx,cartermp/corefx,ptoonen/corefx,ptoonen/corefx,SGuyGe/corefx,richlander/corefx,mazong1123/corefx,janhenke/corefx,axelheer/corefx,Chrisboh/corefx,krk/corefx,billwert/corefx,rubo/corefx,alexperovich/corefx,nchikanov/corefx,stone-li/corefx,stone-li/corefx,ellismg/corefx,mafiya69/corefx,billwert/corefx,mafiya69/corefx,alphonsekurian/corefx,ravimeda/corefx,krk/corefx,alphonsekurian/corefx,jhendrixMSFT/corefx,tstringer/corefx,fgreinacher/corefx,fgreinacher/corefx,shahid-pk/corefx,axelheer/corefx,iamjasonp/corefx,nbarbettini/corefx,richlander/corefx,jcme/corefx,elijah6/corefx,yizhang82/corefx,shimingsg/corefx,jhendrixMSFT/corefx,MaggieTsang/corefx,cydhaselton/corefx,stone-li/corefx,Petermarcu/corefx,shahid-pk/corefx,nbarbettini/corefx,dhoehna/corefx,Petermarcu/corefx,seanshpark/corefx,rahku/corefx,dhoehna/corefx,cartermp/corefx,Chrisboh/corefx,khdang/corefx,twsouthwick/corefx,gkhanna79/corefx,mokchhya/corefx,DnlHarvey/corefx,parjong/corefx,kkurni/corefx,Ermiar/corefx,mokchhya/corefx,stephenmichaelf/corefx,seanshpark/corefx,jhendrixMSFT/corefx,janhenke/corefx,shmao/corefx,iamjasonp/corefx,ericstj/corefx,YoupHulsebos/corefx,tstringer/corefx,rahku/corefx,ericstj/corefx,ravimeda/corefx,axelheer/corefx,SGuyGe/corefx,krk/corefx,cydhaselton/corefx,iamjasonp/corefx,Ermiar/corefx,alphonsekurian/corefx,dsplaisted/corefx,ellismg/corefx,ViktorHofer/corefx,jcme/corefx,MaggieTsang/corefx,zhenlan/corefx,DnlHarvey/corefx,rahku/corefx,Petermarcu/corefx,shmao/corefx,rubo/corefx,dhoehna/corefx,gkhanna79/corefx,Jiayili1/corefx,dhoehna/corefx,marksmeltzer/corefx,lggomez/corefx,nbarbettini/corefx,shmao/corefx,DnlHarvey/corefx,mmitche/corefx,alexperovich/corefx,benpye/corefx,Petermarcu/corefx,cydhaselton/corefx,benjamin-bader/corefx,nchikanov/corefx,richlander/corefx,elijah6/corefx,ericstj/corefx,gkhanna79/corefx,ellismg/corefx,shahid-pk/corefx,elijah6/corefx,DnlHarvey/corefx,kkurni/corefx,ptoonen/corefx,jlin177/corefx,marksmeltzer/corefx,alphonsekurian/corefx,wtgodbe/corefx,seanshpark/corefx,ViktorHofer/corefx,weltkante/corefx,ravimeda/corefx,YoupHulsebos/corefx,krytarowski/corefx,rubo/corefx,ptoonen/corefx,gkhanna79/corefx,yizhang82/corefx,parjong/corefx,parjong/corefx,shimingsg/corefx,benjamin-bader/corefx,tijoytom/corefx,shimingsg/corefx,stone-li/corefx,JosephTremoulet/corefx,billwert/corefx,krk/corefx,BrennanConroy/corefx,ravimeda/corefx,YoupHulsebos/corefx,pallavit/corefx,stephenmichaelf/corefx,rahku/corefx,jcme/corefx,shimingsg/corefx,dsplaisted/corefx,tijoytom/corefx,tijoytom/corefx,krk/corefx,ViktorHofer/corefx,benpye/corefx,rjxby/corefx,JosephTremoulet/corefx,MaggieTsang/corefx,Jiayili1/corefx,kkurni/corefx,jlin177/corefx,tijoytom/corefx,shahid-pk/corefx,Chrisboh/corefx,SGuyGe/corefx,zhenlan/corefx,ptoonen/corefx,shimingsg/corefx,wtgodbe/corefx,jhendrixMSFT/corefx,yizhang82/corefx,iamjasonp/corefx,twsouthwick/corefx,yizhang82/corefx,MaggieTsang/corefx,janhenke/corefx,khdang/corefx,pallavit/corefx,twsouthwick/corefx,tstringer/corefx,alexperovich/corefx,benjamin-bader/corefx,dotnet-bot/corefx,Priya91/corefx-1,ravimeda/corefx,ericstj/corefx,manu-silicon/corefx,mokchhya/corefx,manu-silicon/corefx,benjamin-bader/corefx,dotnet-bot/corefx,iamjasonp/corefx,dotnet-bot/corefx,DnlHarvey/corefx,benpye/corefx,gkhanna79/corefx,Chrisboh/corefx,rjxby/corefx,yizhang82/corefx,nbarbettini/corefx,twsouthwick/corefx,JosephTremoulet/corefx,Ermiar/corefx,jlin177/corefx,pallavit/corefx,mazong1123/corefx,jhendrixMSFT/corefx,tijoytom/corefx,weltkante/corefx,cydhaselton/corefx,mokchhya/corefx,BrennanConroy/corefx,dhoehna/corefx,ViktorHofer/corefx,jlin177/corefx