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Jan: in this PR, the blank line is added in a C source file instead of docs file.

That's correct, but these chunks of documentation do make it into the class documentation for io.BytesIO, and thus into sphinx-generated documentation for subclasses created from it.

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At first glance it does not seems to fix the issue (try by simply copying-pasting the docstring to a rst file, but it does not looks like a reStructuredText list even after the newline being added).

But beware: Python docstrings are not intended to be valid reStructuredText, so using autodoc with :inherited-members: with cpython classes as parents is just not supported.

By fixing one, you're opening the path to rewrite all Python docstrings, this is a monumental amount of work that can't be done without first raising the idea on python-ideas@, it getting traction, speaking about it on python-dev@, having PEP 7, PEP 8 and PEP 257 amended... but I personally don't think we'll ever see Sphinx roles in docstrings (who want to see sphinx roles when using help(...) from an interpreter?).

So I'm sadly just closing this PR. But thanks @janlugt for the good intention of fixing something and having taken the time to open a PR, this is greatly appreciated.