bug#43307: 28.0.50; `diff-no-select': no documentation for BUF argument

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: p.stephani2@gmail.com,  43307@debbugs.gnu.org
> Date: Fri, 11 Sep 2020 14:27:48 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Also, the new doc string of diff-no-select uses too much of passive
> > tense; can we improve that?
> 
> I've taken a what of it.
> 
> > And finally, the SWITCHES argument is left semi-documented, since the
> > doc string of 'diff' doesn't tell what happens in non-interactive
> > calls if SWITCHES is specified, and doesn't say what should be its
> > form in that case.
> 
> I've now removed the punting to diff and just explained the options in
> this doc string.
> 
> > Thanks, but please backport this to the release branch, as doc changes
> > should be installed there.
> 
> If the final result now looks OK, I can backport it.  It didn't seem
> important enough (it's an internal function) to me, though.

I think you forgot to push...