[Cin] Slight update for differences.pdf

[mat]

On Sun, 2022-02-13 at 19:53 -0700, Phyllis Smith via Cin wrote:
> For some reason, today I decided to update the differences.pdf file
> at:
>     https://cinelerra-gg.org/download/differences.pdf
> The * in the rightmost column shows lines I changed - not very many,
> just 25 of them.  But the previous last update was 10/25/2019 so I
> wanted to get it up to date.  I did not update the count for formats,
> codecs, colormodels, decoders, encoders and muxers but will try to do
> that when FFmpeg 5.1 is released and updated on CinGG.

Excellent. One note: near the end, the line "gang track .. " seems to
have a different font.

MatN