[docs] [issue37488] Document the "gotcha" behaviors in utcnow() and utcfromtimestamp()

[Joannah Nanjekye]

Change by Joannah Nanjekye <nanjekyejoannah at gmail.com>:


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keywords: +patch
pull_requests: +15426
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/15773

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<https://bugs.python.org/issue37488>
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