[docs] [issue22341] Python 3 crc32 documentation clarifications

[Martin Panter]

Martin Panter added the comment:

Posting a new patch that also removes the masking from the gzip, zipfile, tarfile, and test_zlib modules. I removed the comment about signedness in tarfile; let me know if you saw any others.

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versions: +Python 3.5 -Python 3.4
Added file: http://bugs.python.org/file38398/crc-sign.v2.patch

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