Fix typo in TypeVar docstring (#8142)

"can be used do declare" → "can be used to declare"

diff --git a/Lib/typing.py b/Lib/typing.py
index a95eb2e184a0f44a724b3d62835dd7eab28dcc83..48992633ac349dc21cea93f2d77f827bec0e2f33 100644 (file)
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -509,7 +509,7 @@ class TypeVar(_Final, _Immutable, _root=True):
     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.