Prepare release notes for next release (#1107)

Author: ela-kotulska-frequenz

RELEASE_NOTES.md

@@ -1,16 +1,8 @@
 # Frequenz Python SDK Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
 ## Upgrading
 
 ## New Features
 
-
 - `frequenz.sdk.config.load_config()` can now use a base schema to customize even further how data is loaded.
 
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->