Update highlights

Co-authored-by: Will <[email protected]>
Signed-off-by: Karishma Chawla <[email protected]>

docs/release-notes/v0.39.0.md

@@ -10,17 +10,14 @@ If you're new to Radius, check out our website, [radapp.io](https://radapp.io),
 
 ## Highlights
 
-### Dapr Building Block: Configuration Store
-https://github.com/radius-project/radius/pull/7906
+### Support for Dapr Configuration Building Block
+A new `Applications.Dapr/configurationStores` resource type is now available, which enables built-in support for the Dapr [Configuration](https://docs.dapr.io/getting-started/quickstarts/configuration-quickstart/) building block in Radius. The Dapr Configuration building block allows for dynamic configuration updates, including feature flag management, and is a great addition to the set of supported Dapr features in Radius. To learn more, go to the [Dapr Configuration Store resource schema](https://docs.radapp.io/reference/resource-schema/dapr-schema/configurationstore/) in the Radius documentation.
 
-### Add an in-memory data store
-https://github.com/radius-project/radius/pull/7950
-
-### Implement PostgreSQL datastore
-https://github.com/radius-project/radius/pull/7961
+### In-memory data store for testing and development
+Radius has added an implementation for an in-memory version of the data store interface, which may be used for testing and development purposes. This helps to speed up and simplify the existing ETC.d and mocking mechanisms that are frequently used today in tests.
 
 ## Breaking changes
-https://github.com/radius-project/radius/pull/7906
+None.
 
 ## Upgrading to Radius v0.39.0