[Cin] Slight update for differences.pdf

[Phyllis Smith]

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.
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