[issue43720] Document various preexisting stdlib deprecations related to import for removal in Python 3.12

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:


New changeset dc6d3e1e4c0c1e4b2210edab8fb4762569dc2936 by Brett Cannon in branch 'master':
bpo-43720: Update import-related stdlib deprecation messages to say they will be removed in Python 3.12 (GH-25167)
https://github.com/python/cpython/commit/dc6d3e1e4c0c1e4b2210edab8fb4762569dc2936


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