bug#37538: [PATCH] Add docstring for `tags-complete-tags-table-file'.

[Hong Xu]

On 10/7/19 9:18 AM, Eli Zaretskii wrote:
> > From: Lars Ingebrigtsen <larsi@gnus.org>
> > Cc: Eli Zaretskii <eliz@gnu.org>,  37538@debbugs.gnu.org
> > Date: Mon, 07 Oct 2019 06:13:54 +0200
> >
> > Hong Xu <hong@topbug.net> writes:
> >
> > > Please see my update below. I'm writing in this concise form because `(elisp) 
> > > Programmed Completion' has a lot of explanation and I don't think we should 
> > > repeat them here.
> >
> > Looks good to me.  I've now applied it to Emacs 27.
>
> The doc string talks about WHAT and refers to the ELisp manual, but
> that node in the manual doesn't mention anything called WHAT.

Would the following docstring work for you (will be reformatted)? Because the 
function accepts the same arguments as the one documented in `(elisp) 
Programmed Completion', I thought it should be understandable that WHAT refers 
to the third argument.

The meaning of the arguments are the same as the function form of
COLLECTION as explained in Info node `(elisp) Programmed
Completion', except that if the third parameter (WHAT) does not equal t, it is 
treated
as if it were nil.