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

[Paul Eggert]

Eli Zaretskii wrote:
> But the fix (for the next release) is easy and safe: just add an
> appropriate @documentencoding.  So I don't see why we should avoid
> fixing this.

Then I'm puzzled, because when I did pretty much just that in
trunk bzr 115807, you reverted the patch.  It's fine with me
if we reinstall that patch.