bug#20011: etc/PROBLEMS: updates, wording, typos

[Eli Zaretskii <eliz@gnu.org>]

> From: Ivan Shmakov <ivan@siamics.net>
> Date: Thu, 05 Mar 2015 21:49:22 +0000
> 
> 	Please consider the patch MIMEd.
> 
> 	* etc/PROBLEMS: Use 'which' where appropriate (was: 'that');
> 	mention visible-cursor; a few more mentions of ~/.Xresources and
> 	xrdb(1); refer to 'GNU Coreutils' and 'X Window' (were:
> 	'GNU Fileutils' and 'X Windows', respectively); other similar
> 	fixes and updates.

There's nothing wrong with using "that" in these contexts, it's pretty
standard English usage, and we use it all over the place in the Emacs
documentation.

So please submit a patch without those parts.

Also, "X Window" is incorrect; use "X Window system" or just "X"
instead.

This part:

>  Alternatively, if you want a blinking underscore as your Emacs cursor,
> -change the "cvvis" capability to send the "\E[?25h\E[?0c" command.
> +set the `visible-cursor' variable to nil in your ~/.emacs:
> +  (setq visible-cursor nil)

replaces a recipe with an entirely different one.  Why not keep both?

Thanks.