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

[Tahia K]

Change by Tahia K <tahia.khan at gmail.com>:


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keywords: +patch
pull_requests: +15531
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15890

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35784>
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