Reset release notes (#1225)

Author: ela-kotulska-frequenz

RELEASE_NOTES.md

@@ -1,9 +1,17 @@
 # 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.
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## 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.
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->