Issue #21569: merge from 3.4
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst
index 249f6d6..8e0d3aa 100644
--- a/Doc/whatsnew/2.7.rst
+++ b/Doc/whatsnew/2.7.rst
@@ -437,7 +437,7 @@
    :mod:`argparse` documentation
      The documentation page of the argparse module.
 
-   :ref:`argparse-from-optparse`
+   :ref:`upgrading-optparse-code`
      Part of the Python documentation, describing how to convert
      code that uses :mod:`optparse`.