[FFmpeg-devel] x11grab.c: minor clean up, added more documentation

[Carl Eugen Hoyos]

Sven C. Dack <sven.c.dack <at> virginmedia.com> writes:

>  - Changed the syntax of "nomouse" to "+nomouse" to be more in line
>  - Added documentation for the "+nomouse" option
>  - Fixed existing x11grab documentation

I applied the cosmetic changes, Stefano has to comment on the documentation
updates.

Thank you, Carl Eugen