bug#67062: 30.0.50; [PATCH] Abbreviate the revision in 'vc-annotate' (for Git)

[Eli Zaretskii]

> Date: Fri, 10 Nov 2023 18:49:59 -0800
> From: Jim Porter <jporterbugs@gmail.com>
> 
> Attached is a patch to add a 'short-revision' function for VC backends, 
> and a Git implementation for it.

If this is a Git-only issue, perhaps it would be better to have a
Git-only option, instead of defining a whole new VC method?

In any case, please document whatever is eventually accepted, both in
NEWS and in the manual.  (Frankly, I don't understand why patches are
not submitted with documentation to match to begin with.)