bug#22207: emacs-25 mishandles info code text on Fedora 23

[Glenn Morris]

Eli Zaretskii wrote:

>> Info-quoted face specifies Courier font.
>> I still don't think it's a good idea.
>
> Yes, this is a deliberate feature.  Perhaps we should make it
> dependent on a defcustom.

A face is a customizable object.
The issue is that the default is bad.
Emacs wants a monospace/typewriter style font.
"Sans mono" may be a better default, but I'm sure that will be wrong
sometimes too. Can Emacs do the equivalent of

fc-match "Monospace"

?