[docs] [issue35609] Improve of abc.py docstring

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

These examples teach you how to use abstractclassmethod and similar decorators. But first, docstrings are not tutorial, and second, you should not use them in new code at all, because they are deprecated.

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<https://bugs.python.org/issue35609>
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