fix Scribble module languages to allow submodules
fix Scribble module languages to allow submodules

That is, recognize `module' and `module*' as top-level forms.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket