Add note (#5457)

Author: jpipkin1

blog-cse/2025-06-02-application.md

@@ -17,5 +17,6 @@ We're happy to announce that now when you create or update a first seen or outli
 To learn more, see our information about baselines for [first seen rules](/docs/cse/rules/write-first-seen-rule/) and [outlier rules](/docs/cse/rules/write-outlier-rule/#baselines-for-outlier-rules).
 
 :::note
-This change is rolling out across deployments incrementally and will be available on all deployments by June 12, 2025.
+* This feature update applies only to new and changed first seen and outlier rules. Unchanged existing rules will continue to use their existing baselines.
+* This feature update is rolling out across deployments incrementally and will be available on all deployments by June 12, 2025.
 :::