[issue41621] Document collections.defaultdict parameter default_factory

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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title: defaultdict miss behave when using default_factory passed as kwargs -> Document collections.defaultdict parameter default_factory
versions: +Python 3.11 -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41621>
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