[issue15582] Enhance inspect.getdoc to follow inheritance chains

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I were aware that this can propagate some not well appropriate docstrings from abstract base classes, but Martin expose worse problem: inheriting a docstring by the method with changed signature.

Perhaps we should check if a signature of overriding method is compatible with a signature of base method. But this is hard to implement, and impossible in some cases until all builtins will converted to Argument Clinic.

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