CoqIDE, cosmetic: removing obsolete comments.
CoqIDE, cosmetic: removing obsolete comments.

There is no more uses of "old style preferences" but the comment was
still there.

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