Update release notes

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

RELEASE_NOTES.md

@@ -1,21 +1,11 @@
 # 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 -->
-
-- The `FormulaEngine` is now replaced by a newly implemented `Formula` type.  This doesn't affect the high level interfaces.
+- The `FormulaEngine` is now replaced by a newly implemented `Formula` type.  This doesn't affect the high level interfaces.  `FormulaEngine` is now a deprecated wrapper to `Formula`.
 
 - The `ComponentGraph` has been replaced by the `frequenz-microgrid-component-graph` package, which provides python bindings for the rust implementation.
 
 ## New Features
 
 - The power manager algorithm for batteries can now be changed from the default ShiftingMatryoshka, by passing it as an argument to `microgrid.initialize()`
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->