Merge pull request RasaHQ#5707 from RasaHQ/fix-url-reminders-link

fixing broken link

Author: m-vdb

docs/core/responses.rst

@@ -167,4 +167,4 @@ You may want to proactively reach out to the user,
 for example to display the output of a long running background operation
 or notify the user of an external event.
 To learn more, check out `reminderbot <https://github.com/RasaHQ/rasa/tree/master/examples/reminderbot/README.md>`_ in
-the Rasa examples directory, or the `docs page on this topic <../../core/external-events-and-reminders>`_.
+the Rasa examples directory or look into :ref:`reminders-and-external-events`.