bpo-47235: Note where a typo is intentional in examples

Doc/library/unittest.mock.rst

@@ -2550,7 +2550,7 @@ your assertion is gone:
 
     >>> mock = Mock(name='Thing', return_value=None)
     >>> mock(1, 2, 3)
-    >>> mock.assret_called_once_with(4, 5, 6)
+    >>> mock.assret_called_once_with(4, 5, 6)  # Intentional typo!
 
 Your tests can pass silently and incorrectly because of the typo.
 
@@ -2570,7 +2570,7 @@ attributes on the mock that exist on the real class:
 
     >>> from urllib import request
     >>> mock = Mock(spec=request.Request)
-    >>> mock.assret_called_with
+    >>> mock.assret_called_with  # Intentional typo!
     Traceback (most recent call last):
      ...
     AttributeError: Mock object has no attribute 'assret_called_with'
@@ -2582,7 +2582,7 @@ with any methods on the mock:
 
     >>> mock.has_data()
     <mock.Mock object at 0x...>
-    >>> mock.has_data.assret_called_with()
+    >>> mock.has_data.assret_called_with()  # Intentional typo!
 
 Auto-speccing solves this problem. You can either pass ``autospec=True`` to
 :func:`patch` / :func:`patch.object` or use the :func:`create_autospec` function to create a
@@ -2625,7 +2625,7 @@ any typos in our asserts will raise the correct error::
 
     >>> req.add_header('spam', 'eggs')
     <MagicMock name='request.Request().add_header()' id='...'>
-    >>> req.add_header.assret_called_with
+    >>> req.add_header.assret_called_with  # Intentional typo!
     Traceback (most recent call last):
      ...
     AttributeError: Mock object has no attribute 'assret_called_with'