Update release notes (#1224)

Author: ela-kotulska-frequenz

RELEASE_NOTES.md

@@ -1,17 +1,9 @@
 # Frequenz Python SDK Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
-## Upgrading
-
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
 ## New Features
 
 - The SDK now officially support Python 3.13.
 
 ## Bug Fixes
 
-- Fixed issue where actors would restart instead of stopping when exceptions occurred during cancellation. Actors now properly stop and surface the unhandled exception.
+- Fixed issue where actors would restart instead of stopping when exceptions occurred during cancellation. Actors now properly stop and surface the unhandled exception.