Rename "exc_value" attribute on assertRaises context manager to "exception".
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 0115ffa..b1d27d2 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -898,13 +898,13 @@
              do_something()
 
       The context manager will store the caught exception object in its
-      :attr:`exc_value` attribute.  This can be useful if the intention
+      :attr:`exception` attribute.  This can be useful if the intention
       is to perform additional checks on the exception raised::
 
         with self.assertRaises(SomeException) as cm:
             do_something()
 
-        the_exception = cm.exc_value
+        the_exception = cm.exception
         self.assertEqual(the_exception.error_code, 3)
 
       .. versionchanged:: 2.7