[docs] [issue22341] Python 3 crc32 documentation clarifications

[Roundup Robot]

Roundup Robot added the comment:

New changeset 03c4ca1a34e2 by Martin Panter in branch '3.5':
Issue #22341: Drop Python 2 workaround and document CRC initial value
https://hg.python.org/cpython/rev/03c4ca1a34e2

New changeset 360c1326d8d1 by Martin Panter in branch 'default':
Issue #22341: Merge CRC doc from 3.5
https://hg.python.org/cpython/rev/360c1326d8d1

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nosy: +python-dev

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