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

[Serhiy Storchaka]

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

Double spaces between sentences increase readability. This is not a bug.

Since abstractclassmethod and like are deprecated and should not be used in new code, I do not see a value of extending their docstrings. Too verbose docstrings make using the module help less convenient. I would rather remove existing examples from docstrings. The module documentation contains more modern examples.

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nosy: +serhiy.storchaka

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