bug#58383: 29.0.50; Make it easier to invert vc-prepare-patches-separately

[Eli Zaretskii]

> Cc: 58383@debbugs.gnu.org
> From: Philip Kaludercic <philipk@posteo.net>
> Date: Sun, 13 Nov 2022 13:56:38 +0000
> 
> --- a/lisp/vc/vc.el
> +++ b/lisp/vc/vc.el
> @@ -3391,14 +3391,24 @@ vc-prepare-patch
>  as the default subject for the message (and it will be prompted
>  for when called interactively).  Otherwise a separate message
>  will be composed for each revision, with SUBJECT derived from the
> -invidividual commits.
> -
> -When invoked interactively in a Log View buffer with marked
> -revisions, those revisions will be used."
> +invidividual commits.  When invoked with a numerical prefix
> +argument, the last N revisions will be used.  When invoked
> +interactively in a Log View buffer with marked revisions, those
> +revisions will be used."

Can we take this opportunity to get rid of the passive voice and
clarify the doc string, please?

Thanks.