Apply suggestion from @johnslavik

Author: johnslavik

Lib/test/test_functools.py

@@ -3337,7 +3337,7 @@ def d(self, arg):
             with self.assertRaisesRegex(TypeError, no_positional_re % "function"):
                 @d.register
                 def _() -> None:
-                    """I am not a incorrect method."""
+                    """I am an incorrect method."""
                     return 42
 
             with self.assertRaisesRegex(TypeError, no_positional_re % "function"):