[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)
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
inherit from :class:`unittest.TestCase`.