[docs] [issue33729] Hashlib/blake2* missing 'data' keyword argument

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee: docs at python -> serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33729>
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