[MPlayer-DOCS] OpenGL vos in manpage

[Diego Biurrun]

Reimar Döffinger writes:
> I added everything about the OpenGL vos I could think of at the moment 
> to the manpage.

Thanks.

> Hope I formatted it correctly...

Almost ;)

The manyfmts suboption should be formatted just like the suboptions of
the other drivers, just look at e.g. vesa and do some copy and paste.
BTW, do both gl and gl2 support manyfmts or just gl?

Diego