Fix typo in __match_args__ doc (GH-99785)

A opy of GH-98549, whose author (@icecream17) uses a school computer that blocks the CLA site. I did not mention this in commit comment above so CLA bot does not pick up the name and request the CLA again.
(cherry picked from commit a86d854522)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Miss Islington (bot) 2022-11-25 16:11:48 -08:00 committed by GitHub
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@ -2752,7 +2752,7 @@ Customizing positional arguments in class pattern matching
When using a class name in a pattern, positional arguments in the pattern are not
allowed by default, i.e. ``case MyClass(x, y)`` is typically invalid without special
support in ``MyClass``. To be able to use that kind of patterns, the class needs to
support in ``MyClass``. To be able to use that kind of pattern, the class needs to
define a *__match_args__* attribute.
.. data:: object.__match_args__