Changes to the branching/commit policy

[Christopher Baines <mail@cbaines.net>]

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Hey!

The changes in #63459 have strayed now in to touching the commit policy
[1]. My intent was to simplify the guidance by grouping it better, but I
think the significant change here is that the commit policy now
references the entire branching strategy, rather than just talking about
sending patches for review.

1: https://guix.gnu.org/manual/devel/en/html_node/Commit-Access.html#Commit-Policy

That new branching strategy makes some "should" requirements on sending
patches for review and pushing to topic branches for larger changes. It
also makes a "must" requirement on opening guix-patches issues to track
and manage merging branches.

I'd like to merge these changes next week since they've been up for a
few weeks, so do comment if you have any thoughts or if you'd like more
time to review them.

Thanks,

Chris

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