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

[STINNER Victor]

STINNER Victor added the comment:

> In other words, the documentation looks sufficient to me as-is, and adding special wording for this would only make it longer than it should be.

Adding a note would not hurt.

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status: pending -> open

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