[docs] [issue15468] Edit docs to hide hashlib.md5()

[Roundup Robot]

Roundup Robot added the comment:

New changeset 13ea0a1d7dde by Gregory P. Smith in branch 'default':
issue15468 - use sha256 instead of md5 or sha1 in the examples.
https://hg.python.org/cpython/rev/13ea0a1d7dde

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nosy: +python-dev

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