Improve the first two Ltac examples.
Improve the first two Ltac examples.

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