Small updates regarding code coverage (#30966)
Small updates regarding code coverage (#30966)

* Small updates regarding code coverage

* Update developer-guide.md

* PR feedback

ericstj/corefx,ericstj/corefx,mmitche/corefx,wtgodbe/corefx,ViktorHofer/corefx,Jiayili1/corefx,ViktorHofer/corefx,wtgodbe/corefx,Jiayili1/corefx,mmitche/corefx,ViktorHofer/corefx,wtgodbe/corefx,shimingsg/corefx,mmitche/corefx,shimingsg/corefx,shimingsg/corefx,shimingsg/corefx,Jiayili1/corefx,ViktorHofer/corefx,mmitche/corefx,Jiayili1/corefx,ViktorHofer/corefx,ericstj/corefx,shimingsg/corefx,mmitche/corefx,ViktorHofer/corefx,mmitche/corefx,ViktorHofer/corefx,shimingsg/corefx,BrennanConroy/corefx,ptoonen/corefx,wtgodbe/corefx,Jiayili1/corefx,ptoonen/corefx,wtgodbe/corefx,ericstj/corefx,ptoonen/corefx,ericstj/corefx,BrennanConroy/corefx,ptoonen/corefx,shimingsg/corefx,Jiayili1/corefx,ptoonen/corefx,wtgodbe/corefx,ericstj/corefx,wtgodbe/corefx,Jiayili1/corefx,ptoonen/corefx,mmitche/corefx,ericstj/corefx,BrennanConroy/corefx,ptoonen/corefx