[FFmpeg-cvslog] docs: use -bsf:[vas] instead of -[vas]bsf.

[compn]

On Sat, 25 Feb 2012 04:28:18 +0100 (CET), John Van Sickle wrote:
>ffmpeg | branch: master | John Van Sickle <john.vansickle at gmail.com> | Fri Feb 24 13:46:48 2012 -0500| [d6a77e2b97f3968b99798faeb70e873eb5910849] | committer: Anton Khirnov
>
>docs: use -bsf:[vas] instead of -[vas]bsf.
>
>The latter syntax is now invalid.

hilarious user-hating philosophy.

-compn