doc: update PUBLISHING.md

[phip1611]

UPDATE According to the latest discussions and developments, I'm updating the guide again.

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Old Version

After publishing uefi-raw and uefi, I noticed that the PUBLISHING.md was a bit cumbersome to follow. I simplified things in a way where I think it is more useful and consise for everybody. What do you think?

For example:

I removed some (from my perspective) obvious paragraphs. For example if uefi-raw has a
publicly exported breaking change (such as a new MSRV), then bumping it in uefi is of
course a breaking change too. I don't think I need to remind ourselves for such "obvious" stuff. Do you agree?

I'm open for your opinions! @GabrielMajeri @nicholasbishop

Checklist

• Sensible git history (for example, squash "typo" or "fix" commits). See the Rewriting History guide for help.
• Update the changelog (if necessary)

[GabrielMajeri]

I noticed that the PUBLISHING.md was a bit cumbersome to follow. I simplified things in a way where I think it is more useful and consise for everybody. What do you think?

I think it's great that this document is also getting some attention! I've created it initially when Nicholas joined as a co-maintainer in order to record what I was more-or-less doing for each release. It was clear that it could be improved, but it's hard to determine what's not obvious when you're already familiar with the process.

[phip1611]

Yikes, forgot about this. Will work on it soon.

[phip1611]

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[phip1611]

I hope the new version is fine