bug#9591: 24.0.50; buffer name completion

[Eli Zaretskii]

> Date: Mon, 26 Sep 2011 04:42:48 -0400
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 9591@debbugs.gnu.org, rms@gnu.org
> 
> > From: Stephen Berman <stephen.berman@gmx.net>
> > Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  rms@gnu.org,  
> > 9591@debbugs.gnu.org
> > Date: Mon, 26 Sep 2011 09:56:12 +0200
> > 
> > > But `substring' is not in the default value of completion-styles.  So
> > > how does it come into play here?
> > 
> > Via completion-category-overrides; with emacs -Q:
> 
> Thanks.  This variable should be mentioned in the doc string of
> completion-styles, IMO.

Done (revision 105944 on the trunk).