[3.12] gh-101100: Cleanup `mailbox` docs (GH-113124)#113144

Merged

AlexWaygood merged 1 commit intopython:3.12from hugovk:backport-25061f5-3.12

Dec 14, 2023

+139-123

Commits on Dec 14, 2023

[3.12] pythongh-101100 : Cleanup mailbox docs (pythonGH-113124 )

AlexWaygood
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hugovk
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