Help: Document the expire and external discussion resolve states

Our practice of closing MRs temporarily while discussion takes place in a separate issue isn't always well understood by MR authors. Expiring a MR seems to be better understood, but making it clear that it is also a temporary state is helpful.

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@brad.king As we discussed over email, this will require a new workflow:external-discussion label to be added to Gitlab.

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• 9984d252 - Help: Document the expire and external discussion resolve states

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• beddcdd2 - Help: Document the expire and external discussion resolve states

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I ended up not creating a separate "Temporary" section under "Resolve", but instead I added an explanatory paragraph at the start of the "Resolve" section. I'm happy to rework it to add a separate "Temporary" subsection (or similar) as per your initial suggestion though if you think that would work better than what's here now.

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• 49f5b6f7 - Help: Document the expire and external discussion resolve states

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@ben.boeckel @brad.king Ready for another look.

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+1

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+1

Do: merge

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