Remove HA policy example from OpenStack script

(cherry picked from commit 9debca2)

Author: mkuratczyk

deps/rabbit/docs/set_rabbitmq_policy.sh.example

@@ -1,4 +1,3 @@
 # This script is called by rabbitmq-server-ha.ocf during RabbitMQ
 # cluster start up. It is a convenient place to set your cluster
-# policy here, for example:
-# ${OCF_RESKEY_ctl} set_policy ha-all "." '{"ha-mode":"all", "ha-sync-mode":"automatic"}' --apply-to all --priority 0
+# policy here. See https://www.rabbitmq.com/docs/parameters for examples