fix doc/whats-new.rst entry

Author: kmuehlbauer

doc/whats-new.rst

@@ -39,7 +39,7 @@ Breaking changes
 ~~~~~~~~~~~~~~~~
 - drop support for `cdms2 <https://github.com/CDAT/cdms>`_. Please use
   `xcdat <https://github.com/xCDAT/xcdat>`_ instead (:pull:`8441`).
-  By `Justus Magin <https://github.com/keewis`_.
+  By `Justus Magin <https://github.com/keewis>`_.
 
 - Bump minimum tested pint version to ``>=0.22``. By `Deepak Cherian <https://github.com/dcherian>`_.