Updates deletes

[GregHolmes]

Description

Branched from #2946 due to the risk of losing changes made in the origin branch when rebasing with main. This work was carried out in the middle of the textile to mdx migration which could easily have been lost when rebasing.

Copied from origin branch:

`Main new page: /docs/messages/updates-deletes

(but the majority of the diff is in the api docs, which, sorry to complain, seem to be getting increasingly painful to make any changes to -- there now seem to be six near-duplicate copies of the Message fields table in various places which needed updating and I wouldn't be surprised if there were more I missed)`

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch updates-deletes-b

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