3.12.0 release notes: resolve a conflict

Author: michaelklishin

release-notes/3.12.0.md

@@ -112,6 +112,14 @@ in the `3.11.x` release series.
  * Reduced memory footprint, improved memory use predictability and throughput of classic queues.
    This particularly benefits classic queues with longer backlogs.
 
+   Classic queue v2 (CQv2) storage implementation can be enabled for all classic queues
+   using `rabbitmq.conf`:
+
+   ``` ini
+   # uses CQv2 for all classic queues by default
+   classic_queue.default_version = 2
+   ```
+
    GitHub issues: [#4522](https://github.com/rabbitmq/rabbitmq-server/pull/4522), [#7516](https://github.com/rabbitmq/rabbitmq-server/pull/7516)
 
  * Reduced peak memory footprint of quorum queues.