Merge pull request #617 from oliver-sanders/validate-task-messages-and-outputs

remove duplicate index

Author: wxtim

src/user-guide/task-implementation/job-scripts.rst

@@ -185,6 +185,7 @@ Task messages are validated by
 :py:class:`cylc.flow.unicode_rules.TaskMessageValidator`.
 
 .. autoclass:: cylc.flow.unicode_rules.TaskMessageValidator
+   :noindex:
 
 Aborting Job Scripts on Error
 -----------------------------