[Cin] small note on documentation

[Andrew Randrianasulu]

may be page
https://cinelerra-gg.org/download/CinelerraGG_Manual/Tips_Improving_Smaller_Comp.html
in section where it talks about speeding up ffmpeg plugins  can benefit
from direct link to specific section?

https://cinelerra-gg.org/download/CinelerraGG_Manual/Speed_up_Ffmpeg_plugin_usag.html

also, I think usual _decoding_ tricks like lowres and skiploopfilter might
work in opts files? (need to doublecheck)
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