fix typo

Author: MeeraDi

articles/communication-services/concepts/voice-video-calling/real-time-text.md

@@ -5,7 +5,7 @@ description: This article describes Real Time Text (RTT) in Azure Communication
 author: ahammer
 ms.date: 06/24/2025
 ms.author: adamhammer
-ms.topic: concept-articles
+ms.topic: concept-article
 ms.service: azure-communication-services
 ms.subservice: calling
 ---