[issue42391] Clarify documentation of TestCase.assertIs

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:


New changeset bd8c22e1fa8f8f6e31ee083a8b9321a2c324f02f by Ram Rachum in branch 'master':
bpo-42391: Clarify documentation of TestCase.assertIs (GH-23348)
https://github.com/python/cpython/commit/bd8c22e1fa8f8f6e31ee083a8b9321a2c324f02f


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nosy: +terry.reedy

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