[issue38407] Add docstrings for typing.SupportsXXX classes

[Serhiy Storchaka]

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


New changeset 0b354fc2bfe1a4624551907df396ed36ea8bf4ca by Serhiy Storchaka in branch '3.7':
[3.7] bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644). (GH-16673)
https://github.com/python/cpython/commit/0b354fc2bfe1a4624551907df396ed36ea8bf4ca


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<https://bugs.python.org/issue38407>
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