bug#60983: 29.0.60; Tree-sitter user-level control

[Eli Zaretskii]

> From: Theodor Thornhill <theo@thornhill.no>
> Cc: casouri@gmail.com, 60983@debbugs.gnu.org
> Date: Sat, 28 Jan 2023 19:41:26 +0100
> 
> >> Let me know if there are any other changes needed.  I'll have some time
> >> this evening to do some hacking if needed :)
> >
> > Will do.
> 
> Installed.

Thanks, I've now added to the Emacs manual the user-level
documentation of tree-sitter features.  Please take a look and tell if
anything is missing/incorrect.