Adding a couple of missing keywords in coqdoc.
Adding a couple of missing keywords in coqdoc.

Fixes #14169.

coq/coq,SkySkimmer/coq,Zimmi48/coq,JasonGross/coq,coq/coq,JasonGross/coq,Zimmi48/coq,JasonGross/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq,SkySkimmer/coq,ejgallego/coq,SkySkimmer/coq,coq/coq,coq/coq,SkySkimmer/coq,ejgallego/coq,JasonGross/coq,Zimmi48/coq