bug#16292: 24.3.50; info docs now contain single straight quotes instead of `'

[Paul Eggert]

Eli Zaretskii wrote:
> There's no expertise involved in "make info".

Typical Emacs users don't run 'make info'.
And even for the few who do run it, it does nothing
unless they also edit a .texi file, which is
something typical users also are unlikely to
do.  The rare user who's expert enough to edit
the manual, run 'make info', and care about
how the resulting quotes look, should be able
to understand and act on suggestions either to use
Texinfo 4 or to update to the post-freeze trunk.

> My suggestion solves more potential problems

I'm afraid not.  Avoiding @documentencoding causes
Texinfo 5 to mishandle UTF-8 characters when generating
formats such as HTML, so that's a non-starter.
And both it and --disable-encoding cause the
regression that Drew noted.  So it'd be unwise
to use either approach postfreeze when we build the
tarball's Info files with Texinfo 5 -- and these are
the most commonly-used Info files.