Update articles/ai-services/speech-service/text-to-speech-avatar/content-credentials.md

Co-authored-by: Eric Urban <[email protected]>

Author: sally-baolian

articles/ai-services/speech-service/text-to-speech-avatar/content-credentials.md

@@ -39,7 +39,7 @@ You may leverage content credentials by:
 
 No additional set-up is necessary. Content credentials are automatically applied to all applicable videos generated by the Azure text to speech avatar.
 
-### Verifying that a video file has content credentials
+## Verifying that a video file has content credentials
 
 As for now, self-serve verification of content credentials for text to speech avatar video isn't yet available. You can contact [[email protected]](mailto:[email protected]) through email for verification of content credentials of Azure text to speech avatar generated videos.