[issue25133] Clarify that the constants in selectors are module-level

[Roundup Robot]

Roundup Robot added the comment:

New changeset f03c074b6242 by Brett Cannon in branch 'default':
Merge for issue #25133
https://hg.python.org/cpython/rev/f03c074b6242

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nosy: +python-dev

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<http://bugs.python.org/issue25133>
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