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Fix typo in TypeVar docstring (GH-8142)

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"can be used do declare" → "can be used to declare"
(cherry picked from commit 86bfed372b)

Co-authored-by: João D. Ferreira <jotomicron@gmail.com>
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Miss Islington (bot) 2018-07-07 09:05:36 -07:00 • committed by GitHub
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Lib/typing.py
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@ -509,7 +509,7 @@ def longest(x: A, y: A) -> A:
At runtime, isinstance(x, T) and issubclass(C, T) will raise TypeError.
Type variables defined with covariant=True or contravariant=True
can be used do declare covariant or contravariant generic types.
can be used to declare covariant or contravariant generic types.
See PEP 484 for more details. By default generic types are invariant
in all type variables.