[docs] [issue22341] Python 3 crc32 documentation clarifications

[Martin Panter]

Martin Panter added the comment:

Patch v3:

* Reverted to original crc32(b"hello") example call with the implicit initial CRC
* Added “Changed in version 3.0” notices, restoring a brief version of the suggestion to use the bit mask, along with an explanation.

Python 2 compatibility information is generally unprecedented in the Python 3 documentation though, but hopefully this version should make more sense to people not already familiar with the Python 2 odd behaviour.

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Added file: http://bugs.python.org/file38737/crc-sign.v3.patch

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