Update closed-captions-android.md

remove double prereqs

Author: valindrae

articles/communication-services/quickstarts/voice-video-calling/includes/closed-captions/closed-captions-android.md

@@ -11,8 +11,6 @@ ms.topic: include
 ms.service: azure-communication-services
 ---
 
-## Prerequisites
-
 ## Prerequisites
 - Azure account with an active subscription, for details see [Create an account for free.](https://azure.microsoft.com/free/)
 - Azure Communication Services resource. See [Create an Azure Communication Services resource](../../../../quickstarts/create-communication-resource.md?tabs=windows&pivots=platform-azp). Save the connection string for this resource.