[docs] [issue16687] Fix small gramatical error and add reference link in hashlib documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset abfd3bc38b5d by Benjamin Peterson in branch '3.3':
fix typo (#16687)
http://hg.python.org/cpython/rev/abfd3bc38b5d

New changeset 95cb2f09ac50 by Benjamin Peterson in branch 'default':
merge 3.3 (closes #16687)
http://hg.python.org/cpython/rev/95cb2f09ac50

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nosy: +python-dev
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16687>
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