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

[Paul Eggert]

Eli Zaretskii wrote:
> If we are going to use Texinfo 4 for generating the manuals in the
> next release, the problem that bothered me will not happen in the Info
> files that will be in the release tarball.

Ah, OK, then we can separate the proposed patch into two parts.
The first just adds @documentencoding lines, and can be installed
now.  The second deals with ASCIIfying the info files, a new feature
that can wait until after the feature freeze is over.  I'm attaching
both patches.

document-encoding.diff
Description: Text Data

ascii-info-marks.diff
Description: Text Data