bug#35290: 27.0.50; Outdated vc-revert documentation

[Eli Zaretskii <eliz@gnu.org>]

> From: Mauro Aranda <maurooaranda@gmail.com>
> Date: Mon, 15 Apr 2019 19:25:52 -0300
> Cc: 35290@debbugs.gnu.org
> 
> > Because the section is called "VC Undo", I guess.
> 
> OK.  But I fail to see a reason why a user, after reading the Undo
> section, would expect that M-x undo acts upon anything that is not
> buffer text.  That is what made me think (perhaps wrongly) that the
> sentence is about the old behavior of revert-buffer.
> 
> At the least, I think the documentation could be improved.  Some of the
> things vc-revert does can be reversed (e.g., bring back the reverted
> changes in the affected buffers) and other changes cannot (or might not,
> I'm not sure of the right wording here).  If that is correct, then both the
> current text and my proposed patch fail to make that clear.

OK, I simply removed that sentence from the manual.

Thanks.