Bug#1030382: encourage Vcs-Git over other Vcs-* headers

[Andrey Rakhmatullin]

On Fri, Feb 03, 2023 at 05:57:21PM +0000, Jelmer Vernooij wrote:
> Sorry, to be clear I also meant encouraging the use of Git as a Vcs - rather 
> than just
> of the Vcs-Git header.
The Policy is a wrong place for this (and the part about Vcs-* headers is
indeed a wrong place for this too).