[issue31939] Support return annotation in signature for Argument Clinic

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I believe we currently have a policy that the python standard library will not include type annotations, that those are provided by typeshed.

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nosy: +r.david.murray

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<https://bugs.python.org/issue31939>
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