Fix docgram's dune file following #12085.
Fix docgram's dune file following #12085.

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