Minor warning message change

Author: seunghun1ee

doc/source/operations/upgrading-openstack.rst

@@ -294,12 +294,9 @@ RabbitMQ 4.1
 
 .. warning::
 
-   The RabbitMQ queue migration and upgrade must be completed before upgrading
-   the environment to Epoxy.
-
-StackHPC Kayobe Config sets RabbitMQ 4.1 as the default for the Epoxy release.
-Existing transient queues must be migrated to durable queues with Queue Manager
-before upgrading to RabbitMQ 4.1.
+   StackHPC Kayobe Config sets RabbitMQ 4.1 as the default for the Epoxy release.
+   Existing transient queues must be migrated to durable queues with Queue Manager
+   before upgrading to RabbitMQ 4.1.
 
 Queue Migration
 ~~~~~~~~~~~~~~~