[docs] [issue19376] document that strptime() does not support the Feb 29 if the format does not contain the year

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Paul Ganssle: Do you want to work on a PR? Or should we close the issue?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19376>
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