[docs] [issue29062] hashlib documentation link error

[INADA Naoki]

INADA Naoki added the comment:

> That is because hashlib-blake2.rst is explicitly added to the TOC list in Doc/library/crypto.rst.

Yes. All rst should be explicitly added by `toctree` or `include`.

In this case, I feel there are no reason to use `include` directive
instead of merging two files.

Another option is adding `toctree` directive in `hashlib.rst`.
But it means we should organize to use sub toctree, like Doc/library/asyncio.rst.

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