bug#22860: [PATCH] vc-hg: prompt for branch to merge

[Eli Zaretskii]

> From: Andrii Kolomoiets <andreyk.mad@gmail.com>
> Date: Sat, 23 Nov 2019 20:51:28 +0200
> Cc: 22860@debbugs.gnu.org
> 
> +*** The Hg (Mercurial) back-end now prompt for branch to merge.
                                       ^^^^^^
"Prompts" is more correct English.

Also, I'm guessing this is about the "C-x v m" command, not in
general?  The NEWS item should say so.

And finally, "C-x v m" is described in the user manual, but it only
talks about Git and Bazaar; I thin we should mention Mercurial there
as well.