[docs] [issue22341] Python 3 crc32 documentation clarifications

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The patch LGTM.

But while we are here, wouldn't be worth to unify the name of second parameter of binascii and zlib CRC calculation functions? And unify the description of crc_hqx() with other functions.

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<http://bugs.python.org/issue22341>
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