Issue #21860: Correct docstrings of FileIO.seek() and FileIO.truncate() methods.

Patch by Terry Chia.

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branch : 3.4
Issue #22427: TemporaryDirectory no longer attempts to clean up twice when
used in the with statement in generator.

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branch : 3.4
Issue #16056: Rename test method in test_statistics to avoid conflict.

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branch : 3.4
Improve English phrasing in asyncio task docs.

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branch : 3.4
Apply asyncio Task English fixes to docstrings as well.

Also fixed the phrasing in a comment.

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branch : 3.4
test_faulthandler: fix typo

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branch : 3.4
allow archives for rc releases to be built (closes #22484)

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branch : 3.4