bug#47529: Make quoted entities stand out more in info

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Sun, 4 Apr 2021 03:50:16 -0500
> Cc: rgm@gnu.org, laszlomail@protonmail.com, 47529@debbugs.gnu.org
> 
> > I don't even understand what bug#20721 is about anymore (the first
> > part, regarding using a newer Texinfo, was done long ago).
> 
> >From the original bug report:
> 
>     Summary: I want the Info buffer to be colorized, so that I have enough
>     visual clues to skim it quickly.  I find the Emacs provided default VERY
>     disconcerting.

But the discussion is about something very different.