Rename one example to avoid duplicate errors with sphinx

docs/source/development/wrapperkernels.rst

@@ -116,7 +116,7 b' You can override a number of other methods to improve the functionality of your'
 kernel. All of these methods should return a dictionary as described in the
 relevant section of the :doc:`messaging spec <messaging>`.
 
-.. class:: MyKernel
+.. class:: MyBetterKernel
 
    .. method:: do_complete(code, cusor_pos)