bug#32731: 26.1.50; Ibuffer filter by mode: Handle >1 mode names

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Cc: npostavs@gmail.com,  32731@debbugs.gnu.org
> Date: Fri, 21 Sep 2018 17:37:39 +0900
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Tino Calancha <tino.calancha@gmail.com>
> >> Date: Wed, 19 Sep 2018 18:23:52 +0900
> >> Cc: 32731@debbugs.gnu.org
> >> 
> >> Following patch adds a key :composable, which also serves as
> >> documentation.
> >
> > Thanks, a few nits to the documentation parts:
> Thank you.
> I've amended the patch to address all the nits:

Thanks, this LGTM.