Clear release notes (frequenz-floss#1090)

Author: shsms

RELEASE_NOTES.md

@@ -2,24 +2,16 @@
 
 ## Summary
 
-The SDK starts using the [`frequenz-quantities`](https://pypi.org/project/frequenz-quantities/) package with this release.
-
-A new method for streaming reactive power at the grid connection point has been added, and the `ConfigManagingActor` has been improved.
+<!-- Here goes a general summary of what this release is about -->
 
 ## Upgrading
 
-- Replace `Quantity` and its sub-classes (`Power`, `Current`, etc.) in the `frequenz.sdk.timeseries` module with the external [`frequenz-quantities`](https://pypi.org/project/frequenz-quantities/) package. Please add the new library as a dependency and adapt your imports if you are using these types.
-- The `QuantityT` has been moved to the `frequenz.sdk.timeseries._base_types` module.
-- The `QuantityT` doesn't include itself (`QuantityT`) anymore.
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
 
 ## New Features
 
-- `ConfigManagingActor`: The file polling mechanism is now forced by default. Two new parameters have been added:
-  - `force_polling`: Whether to force file polling to check for changes. Default is `True`.
-  - `polling_interval`: The interval to check for changes. Only relevant if polling is enabled. Default is 1 second.
-
-- Add a new method `microgrid.grid().reactive_power` to stream reactive power at the grid connection point.
+<!-- Here goes the main new features and examples or instructions on how to use them -->
 
 ## Bug Fixes
 
-- Many long running async tasks including metric streamers in the BatteryPool now have automatic recovery in case of exceptions.
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->