[FFmpeg-devel] some random docu patches

[Roger Pack]

> > Of course, my personal preference would be to make the entire docu
> > into a wiki, then it could be elaborated/expanded on more easily...
>
> And let the users edit the syntax for the various commands? Reference
> technical documentation != community driven documentation, they have
> two complementary targets and purposes.
>

Maybe once wiki pages exist that are "for a particular filter" then links
can be added to them from the documentation.
That might be happy medium. "See here for community documentation on this
filter." etc.