Update CHANGELOG.md

Co-authored-by: Ville Välimäki <110451292+villevsv-upcloud@users.noreply.github.com>

Author: scop

CHANGELOG.md

@@ -11,7 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 
-- Support for discontinued non-managed object storage product
+- Support for discontinued non-managed object storage product. Note: treated as non-breaking change as all users have been migrated to the new managed product
 
 ## [2.8.0] - 2025-08-18