[docs] [issue24842] Mention SimpleNamespace in namedtuple docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 678d93c273de by Raymond Hettinger in branch 'default':
Issue #24842:  Cross-reference types.SimpleNamespace from the namedtuple docs
https://hg.python.org/cpython/rev/678d93c273de

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24842>
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