[Cin] CinelerraGG_manual

[Andrea paz]

In the new unified manual, in the Setting chapter (Settings -->
Preferences), there are missing or unclear entries (for me). Does
anyone know them and how to use them?

PLAYBACK A TAB:
- Enable subtitles/captioning
- Labels cells
- TOC Program No

RECORDING TAB:
- Realtime TOC
- DVB Adapter
- Follow audio config

APPEARANCE TAB:
- ffmpeg probe warns rebuild indexes