Document changed warnings and erros following #12038.
Document changed warnings and erros following #12038.

coq/coq,SkySkimmer/coq,JasonGross/coq,JasonGross/coq,silene/coq,gares/coq,ejgallego/coq,gares/coq,Zimmi48/coq,SkySkimmer/coq,JasonGross/coq,Zimmi48/coq,Zimmi48/coq,silene/coq,gares/coq,SkySkimmer/coq,SkySkimmer/coq,ejgallego/coq,coq/coq,gares/coq,silene/coq,coq/coq,Zimmi48/coq,ejgallego/coq,coq/coq,ejgallego/coq,gares/coq,JasonGross/coq