[3.14] gh-44538: Mention nested classes/functions in doctest docs (GH-137870) (#137918)

Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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@ -350,6 +350,13 @@ searches them recursively for docstrings, which are then scanned for tests.
Any classes found are recursively searched similarly, to test docstrings in
their contained methods and nested classes.
.. note::
``doctest`` can only automatically discover classes and functions that are
defined at the module level or inside other classes.
Since nested classes and functions only exist when an outer function
is called, they cannot be discovered. Define them outside to make them visible.
.. _doctest-finding-examples: