Another 3.8.24 release notes update

Author: michaelklishin

release-notes/3.8.24.md

@@ -65,6 +65,12 @@ consistent release schedule.
 
    GitHub issue: [#https://github.com/rabbitmq/rabbitmq-server/pull/3506](https://github.com/rabbitmq/rabbitmq-server/pull/3506)
 
+ * Info message grammar
+
+   Contributed by @tuxiqae
+
+   GitHub issue: [#3680](https://github.com/rabbitmq/rabbitmq-server/pull/3680)
+
 #### Enhancements
 
  * `cluster_formation.target_cluster_size_hint` is a new configuration setting that can be used to specify expected initial cluster size.