bug#37956: Elisp manual referes obsolete lisp file.

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Mon, 28 Oct 2019 15:47:05 +0100
> Cc: 37956@debbugs.gnu.org
> 
> > In Elisp manual -> Debugging -> Edebug -> Printing in Edebug, the manual 
> > says
> >
> > Other programs can also use custom printing; see cust-print.el fo rdetails.
> >
> > http://git.savannah.gnu.org/cgit/emacs.git/tree/doc/lispref/edebug.texi#n875
> >
> > , but cust-print.el is obsolete since emacs-24.3.
> 
> Thanks for the report.
> 
> Perhaps we could simply to remove it like in the attached patch?

We moved cuts-print.el to obsolete/ because its features are supported
by the Lisp printer.  So I'd prefer to modify that sentence to mention
the latter, rather than just remove it.

Btw, this sentence and one earlier mentions "custom printing" without
explaining what that means, AFAICT.  It would be good to fix this
while at that.

Thanks.