[docs] [issue29062] hashlib documentation link error

[Roundup Robot]

Roundup Robot added the comment:

New changeset c75ef013bca3 by INADA Naoki in branch 'default':
Issue #29062: doc: Fix heading level of hashlib-blake2
https://hg.python.org/cpython/rev/c75ef013bca3

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