[Cin] Typoes in documentation and possibly errors in FFmpeg config dir

[Andrea paz]

@Miroslav Rovis
Thanks for pointing out the error; I've changed the manual, but if
anyone notices other sections with the wrong "acc", please let me
know.
The git introduction to the "Overview on Formats and Codecs" section
can be found here:
https://git.cinelerra-gg.org/git/?p=goodguy/cin-manual-latex.git;a=commit;h=a5d793d4b19799c05f4179a79a0843e6b7fe50c9
Subsequently, there were other corrections.
@Phyllis
You also need to change the preset name "acc256k.pro" to "aac256k.pro"
in the source code.
I attach the changes in the manual.
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