Update video-calling-unity.md

Update video calling unity quickstart

Author: DaybreakQuip

articles/communication-services/quickstarts/voice-video-calling/includes/video-calling/video-calling-unity.md

@@ -8,6 +8,8 @@ ms.author: DaybreakQuip
 
 In this quickstart, you learn how to start a call using the Azure Communication Services Calling SDK for Unity. For receiving and rendering video frames on the Unity platform, refer to the [Raw Media Access Quickstart](../../get-started-raw-media-access.md).
 
+You can download the sample app from [GitHub](https://github.com/Azure-Samples/communication-services-dotnet-quickstarts/tree/main/RawVideo).
+
 ### Prerequisites
 
 To complete this tutorial, you need the following prerequisites:
@@ -1847,7 +1849,7 @@ public class AppManager : MonoBehaviour
     private CallClient callClient;
     private CallAgent callAgent;
     private DeviceManager deviceManager;
-    private Call call;
+    private CommunicationCall call;
     private LocalOutgoingAudioStream micStream;
     private LocalVideoStream cameraStream;
 
@@ -1891,7 +1893,7 @@ public class AppManager : MonoBehaviour
         // Handle incoming call event
     }
 
-    private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
+    private async void OnStateChangedAsync(object sender, Azure.Communication.Calling.UnityClient.PropertyChangedEventArgs args)
     {
         // Handle connected and disconnected state change of a call
     }
@@ -2137,9 +2139,9 @@ private async void OnIncomingCallAsync(object sender, IncomingCallReceivedEventA
 `StateChanged` event on `Call` object is fired when an in progress call transactions from one state to another. Application is offered the opportunities to reflect the state changes on UI or insert business logics.
 
 ```C#
-private async void OnStateChangedAsync(object sender, PropertyChangedEventArgs args)
+private async void OnStateChangedAsync(object sender, Azure.Communication.Calling.UnityClient.PropertyChangedEventArgs args)
 {
-    var call = sender as Call;
+    var call = sender as CommunicationCall;
 
     if (call != null)
     {