4.0.4 release notes: a typo

Author: michaelklishin

release-notes/4.0.4.md

@@ -95,10 +95,10 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
    The tags are configured using `rabbitmq.conf`:
 
    ```ini
-   cluster_tags.environment = production
+   nodes_tags.environment = production
 
-   cluster_tags.region = us-east
-   cluster_tags.az = us-east-3
+   nodes_tags.region = us-east
+   nodes_tags.az = us-east-3
    ```
 
    Contributed by @SimonUnge.