[issue15582] Enhance inspect.getdoc to follow inheritance chains

[Ethan Furman]

Ethan Furman added the comment:

I know it will take some time to add doc strings to places where they are missing, but I would not roll-back the patch for that.  File new issues and get the over-riding methods properly documented.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15582>
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