Mention #4368 in 3.10 release notes

Author: michaelklishin

release-notes/3.10.0.md

@@ -193,6 +193,11 @@ This release includes all bug fixes that shipped in `3.9.x` releases.
 
    GitHub issue: [#4073](https://github.com/rabbitmq/rabbitmq-server/pull/4073)
 
+ * Stream delivery rate could drop if concurrent stream consumers consumed in a way
+   that made them reach the end of the stream often.
+
+   GitHub issue: [#4371](https://github.com/rabbitmq/rabbitmq-server/pull/4371)
+
  * Channels could confirm a subset of messages published as mandatory in some cases.
 
    GitHub issue: [#3870](https://github.com/rabbitmq/rabbitmq-server/pull/3870)