[issue24766] Subclass of property doesn't preserve instance __doc__ when using doc= argument

[Berker Peksag]

Berker Peksag added the comment:

test_property_decorator_doc_writable fix has already been committed in cc1aa0e88626.

Here's an updated patch:

* Synced with the default branch
* Adapted the test from duplicate issue 25757 (written by Torsten Landschoff)

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nosy: +berker.peksag, torsten
stage: test needed -> patch review
Added file: http://bugs.python.org/file42683/issue24766.diff

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