Monasca reno followup polish

Change-Id: I2db0ddcdacb1502878609f51c4252210c8d5fd6c

releasenotes/notes/drop_monasca_kafka_storm_zookeeper-161011a0422bbcd1.yaml

@@ -2,7 +2,7 @@
 upgrade:
   - |
     OpenStack Monasca is no longer supported by Kolla Ansible. Support for
-    deploying ``kafka``, ``storm`` and ``zookeeper`` have been dropped since
+    deploying ``kafka``, ``storm`` and ``zookeeper`` has been dropped since
     they have been used only with Monasca. Post-upgrade cleanup of those
     services can be done using ``kolla-ansible monasca_cleanup`` - for
     details please see