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

[Felipe Rodrigues]

Felipe Rodrigues <felipe at felipevr.com> added the comment:

What about adding some more information in the exception message in addition to the docs? I mean, if we're raising an issue because someone inserted Feb 29, we add a note about leap year in the exception message

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nosy: +fbidu

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