Fix name of RabbitMQ HA flag in release note

Author: priteau

releasenotes/notes/enable-rabbitmq-ha-and-update-rabbitmq-version-8eaa68b2a9486320.yaml

@@ -1,11 +1,11 @@
 ---
 features:
   - |
-    The flag ``om_enable_rabbitmq_high-availability`` is now set to ``true``.
+    The flag ``om_enable_rabbitmq_high_availability`` is now set to ``true``.
     Adds tags for new RabbitMQ containers to update to RabbitMQ version 3.9.22.
 upgrade:
   - |
-    The flag ``om_enable_rabbitmq_high-availability`` is now set to ``true``.
+    The flag ``om_enable_rabbitmq_high_availability`` is now set to ``true``.
     As this enables durable queues, RabbitMQ will need to be reset, and the
     services which use it restarted.
     Tags are added to update the RabbitMQ containers to version 3.9.22.