Update release notes

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

Author: shsms

RELEASE_NOTES.md

@@ -6,7 +6,9 @@
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+- The `frequenz.sdk.power` package contained the power distribution algorithm, which is for internal use in the sdk, and is no longer part of the public API.
+
+- `PowerDistributingActor`'s result type `OutOfBound` has been renamed to `OutOfBounds`, and its member variable `bound` has been renamed to `bounds`.
 
 ## New Features
 
@@ -25,3 +27,4 @@
 - Fix `pv_power` not working in setups with 2 grid meters by using a new
   reliable function to search for components in the components graph
 - Fix `consumer_power` similar to `pv_power`
+- Zero value requests received by the `PowerDistributingActor` will now always be accepted, even when there are non-zero exclusion bounds.