fix: correct typo in until_not docstring

Author: lixiang2017

py/selenium/webdriver/support/wait.py

@@ -138,10 +138,10 @@ def until(self, method: Callable[[D], Union[Literal[False], T]], message: str =
         raise TimeoutException(message, screen, stacktrace)
 
     def until_not(self, method: Callable[[D], T], message: str = "") -> Union[T, Literal[True]]:
-        """Wait until the method returns a value that is not False.
+        """Wait until the method returns a value that is False.
 
         Calls the method provided with the driver as an argument until the
-        return value does not evaluate to ``False``.
+        return value evaluates to ``False``.
 
         Parameters:
         -----------