adding missing prod.ini change to analytics documentation

ckanext-hdx_theme/docs/analytics/index.rst

@@ -14,9 +14,11 @@ Setup steps
 -----------
 
 #. The **mixpanel token** needs to be setup in prod.ini under :code:`hdx.analytics.mixpanel.token`
+#. The url to the enqueuing service needs to be setup in prod.ini as in :code:`hdx.analytics.enqueue_url = http://[gislayer_host]:[gislayer_port]/api/send-analytics`
 #. The **gislayer** needs to be setup with the latest code. It's dependencies were updated as well ( *requirements.txt* )
 
    * | there is a new queue for processing analytics requests called **analytics_q**. So we need a rq worker listening on it.
        We can either use a separate worker for each queue or workers that listen on both queues.
    *  Information about how to run the **rqworker** can be found in
       `Running the redis queue worker for analytics <http://agartner.bitbucket.org/hdxjobprocessor/README.html#running-the-redis-queue-worker-for-analytics>`_
+