[docs] [issue35784] document that hashlib.new takes kwargs

[Tahia K]

Tahia K <tahia.khan at gmail.com> added the comment:

Hello,

I just submitted a small PR for this doc change, including the example provided by Jörn (thanks Jörn).

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nosy: +ta1hia

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<https://bugs.python.org/issue35784>
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