[Stream] Add ad playback notice to changelog v1

Author: tsmith512

src/content/changelogs/stream.yaml

@@ -5,6 +5,14 @@ productLink: "/stream/"
 productArea: Developer platform
 productAreaLink: /workers/platform/changelog/platform/
 entries:
+  - publish_date: "2025-02-10"
+    title: Stream Player ad support adjustments for Google Ad Exchange Verification
+    description: |-
+      Adjustments have been made to the Stream player UI when playing advertisements called by a customer-provided VAST or VMAP `ad-url` argument:
+
+      A small progress bar has been added along the bottom of the player. The shadow behind player controls has been reduced. These changes have been approved for use with Google Ad Exchange.
+
+      This only impacts customers using the built-in Stream player and calling their own advertisements; Stream never shows ads by default. For more information, refer to [Using the Stream Player](https://developers.cloudflare.com/stream/viewing-videos/using-the-stream-player/#basic-options).
   - publish_date: "2025-01-30"
     title: Expanded Language Support for Generated Captions
     description: |-