Official manual on readthedocs is missing documentation for sogo and cups. Don’t know if there’s anything else missing.
At least for SOGo I know this is due to it not being part of the Enterprise release, which is documented on readthedocs.
I would suspect the same holds true for CUPS.
If I remember correctly, we never had a SOGo page inside the administrator manual.
I have no problem to include it on the Community manual if someone wants to write it down.
This is completely missing because, just because we really don’t know what to write
I was wrong, cups is in developer manual. Cannot remember about sogo.