Update 3.11.10 release notes

Author: michaelklishin

release-notes/3.11.10.md

@@ -60,6 +60,15 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
    GitHub issues: [#6931](https://github.com/rabbitmq/rabbitmq-server/pull/6931), [#6909](https://github.com/rabbitmq/rabbitmq-server/issues/6909)
 
 
+## OAuth 2 Plugin
+
+### Bug Fixes
+
+ * The `auth_oauth2.preferred_username_claims` key in `rabbitmq.conf` now accepts a list of values.
+
+   GitHub issue: [rabbitmq/rabbitmq-server#7458](https://github.com/rabbitmq/rabbitmq-server/pull/7458)
+
+
 ## Dependency Upgrades
 
  * `ra` was upgraded [from `2.4.6` to `2.4.9`](https://github.com/rabbitmq/ra/releases)