Update toc.yml

Author: sally-baolian

articles/ai-services/speech-service/toc.yml

@@ -546,6 +546,8 @@ items:
           href: /rest/api/aiservices/speechapi/operation-groups
         - name: Batch synthesis REST API
           href: /rest/api/batchtexttospeech/operation-groups
+        - name: Batch avatar REST API
+          href: /rest/api/batchavatar/operation-groups
         - name: Speaker Recognition REST API
           href: /rest/api/speakerrecognition/
           displayName: reference