bug#64018: 29.0.91; Improve tree-sitter docs

[Eli Zaretskii]

> From: Basil Contovounesios <contovob@tcd.ie>
> Cc: 64018@debbugs.gnu.org,  casouri@gmail.com
> Date: Tue, 13 Jun 2023 13:32:36 +0100
> 
> > This should be @code{:@var{keyword}} instead.  That is, the colon is
> > not part of the meta-syntactic variable, it is a literal character.
> 
> I can agree with that, but the result looks a bit jarring to me:

I don't see anything jarring there, FWIW.

But on second thought: why do you need the colon at all?  What does it
signifiy?  If you must say that KEYWORD begins with a colon, just say
that (although it's pretty clear), or maybe show an example.