[Word] (Annotations) Need M365 subscription (#958)

Author: ElizabethSamuel-MSFT

samples/word/50-document/manage-annotations.yaml

@@ -301,6 +301,7 @@ template:
     content: |-
         <section class="ms-Fabric ms-font-m">
             <p>This sample demonstrates how to manage annotations and use annotation events.</p>
+            <p><b>Important</b>: You need a Microsoft 365 subscription in order to use Annotation APIs. See <a target="_blank" href="https://github.com/OfficeDev/office-js/issues/4953">GitHub issue 4953</a> for more information.</p>
         </section>
 
         <section class="ms-Fabric setup ms-font-m">