[docs] [issue29062] hashlib documentation link error

[INADA Naoki]

INADA Naoki added the comment:

1. remove `.. module:: hashlib` from Doc/library/hashlib-blake2.rst
2. merge Doc/library/hashlib-blake2.rst content into Doc/library/hashlib.rst

Hmm, which is better?

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29062>
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