[issue15582] Enhance inspect.getdoc to follow inheritance chains

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Changed test_enum to make buildbots green, but perhaps the docstring of Enum should be changed, because it now is used for all Enum subclasses that doesn't define a docstring explicitly. An alternative solution is to set __doc__ of Enum subclasses to an empty string if the docstring is not defined explicitly.

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<http://bugs.python.org/issue15582>
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