#16433: fix docstring of assertNotEqual.

Lib/unittest/case.py

@@ -628,7 +628,7 @@ class TestCase(object):
         assertion_func(first, second, msg=msg)
 
     def assertNotEqual(self, first, second, msg=None):
-        """Fail if the two objects are equal as determined by the '=='
+        """Fail if the two objects are equal as determined by the '!='
            operator.
         """
         if not first != second: