[refman] Use 'flag' instead of 'opt' for 'Ltac2 Debug'
[refman] Use 'flag' instead of 'opt' for 'Ltac2 Debug'

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