docs: Document the existing deprecation policy #5545
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We recently renamed
jj util mangen
tojj install-manpages
without a deprecation warning, as it was missed in the initial PR. Waleed then fixed it in a follow-up, which led to a longer discussion in the Discord which revealed that not everyone was aware of it and what requires a warning based deprecation.This initially categorizes the policy into user-visible UX changes and small impact renames, like for a small usergroup like packagers and third-party dependencies. If we have more hickups with users, this can be expanded.