[issue16612] Integrate "Argument Clinic" into CPython trunk

[Roundup Robot]

Roundup Robot added the comment:

New changeset f35b3a86ade3 by Meador Inge in branch 'default':
Fix minor bug in dict.__contains__ docstring.
http://hg.python.org/cpython/rev/f35b3a86ade3

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<http://bugs.python.org/issue16612>
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