bug#18077: 24.4.50; Info-quoted face should inherit default

[Stefan Kangas <stefan@marxist.se>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> For `info-quoted' we could use the same font families as e.g.
>> StackOverflow uses for code blocks:
>
> It's probably a good source of inspiration, but we have to take into
> account that the font of the "normal text" is usually proportional in
> stackoverflow, whereas it's usually monospaced in Emacs.

Is this now fixed by this commit, or is there more to do here?

    Author: Paul Eggert <eggert@cs.ucla.edu>
    Date:   Fri May 13 13:30:33 2016 -0700

        Improve display of tex-verbatim and Info quoted

        Problem reported by Glenn Morris (Bug#19889).
        * doc/emacs/display.texi (Standard Faces):
        * doc/lispref/display.texi (Basic Faces):
        * etc/NEWS: Mention fixed-pitch-serif.
        * lisp/faces.el (face-font-family-alternatives):
        New family alias Monospace Serif.
        (fixed-pitch-serif): New face, which uses the new family.
        * lisp/info.el (Info-quoted):
        * lisp/textmodes/tex-mode.el (tex-verbatim): Use the new face.
        * test/lisp/legacy/font-parse-tests.el (font-parse-tests--data):
        Add test case for Monospace Serif.