[MPlayer-DOCS] More sync for the French man page

[Diego Biurrun]

Guillaume POIRIER writes:
> Diego Biurrun wrote:
> > 
> > So what's the rule now?
> An unbreakable space before a colon, and a space after the colon.
> Rrrgh! I really screwed up my explanation here...
> Here is an example that (hopefully) will clarify all this:
> in English:
> (default: none)
> in French:
> (par défaut : aucun)
> --> So in nroff, it would be:
> (par défaut\ : aucun)
> 
> I'm really, really sorry if I confused you here.

No problem, now it's crystal clear.

Diego