[3.12] gh-101100: Fix class reference in library/test.rst (GH-114769) (GH-114794)

The text clearly seems to be referencing `TestFuncAcceptsSequencesMixin`,
for which no target is available. Name the class properly and suppress
the dangling reference.
(cherry picked from commit 7a93db4425)

Co-authored-by: Skip Montanaro <skip.montanaro@gmail.com>
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Miss Islington (bot) 2024-01-31 10:41:10 +01:00 committed by GitHub
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@ -143,7 +143,7 @@ guidelines to be followed:
arg = (1, 2, 3) arg = (1, 2, 3)
When using this pattern, remember that all classes that inherit from When using this pattern, remember that all classes that inherit from
:class:`unittest.TestCase` are run as tests. The :class:`Mixin` class in the example above :class:`unittest.TestCase` are run as tests. The :class:`!TestFuncAcceptsSequencesMixin` class in the example above
does not have any data and so can't be run by itself, thus it does not does not have any data and so can't be run by itself, thus it does not
inherit from :class:`unittest.TestCase`. inherit from :class:`unittest.TestCase`.