add callout note to the Klaviyo Actions destination

Author: forstisabella

src/connections/destinations/catalog/actions-klaviyo/index.md

@@ -20,6 +20,11 @@ Klaviyo (Actions) provides the following benefits:
 - **More control** - Actions-based destinations enable you to define the mapping between the data Segment receives from your sources, and the data Segment sends to Klaviyo.
 - **Default property mappings** - Default mappings from the Segment like event, timestamp, and more, allow data to be mapped correctly without any setup required.
 
+> info ""
+> Segment automatically migrated all classic Klaviyo destinations configured in Cloud mode to the Klaviyo (Actions) destination in June 2024.
+> 
+> If you are a Klaviyo classic user, view information about steps you might need to take in the [Migrate to the Klaviyo (Actions) destination](/docs/connections/destinations/catalog/klaviyo#migrate-to-the-klaviyo-actions-destination) documentation. 
+
 ## Getting started
 
 1. From the Segment web app, click **Catalog**.