Update dominant-speaker-windows.md

Author: jsaurezlee-msft

articles/communication-services/how-tos/calling-sdk/includes/dominant-speaker/dominant-speaker-windows.md

@@ -8,33 +8,31 @@ ms.author: jsaurezlee
 
 [!INCLUDE [Install SDK](../install-sdk/install-sdk-windows.md)]
 
-[!INCLUDE [public-preview-notes](../../../../includes/public-preview-include.md)]
-
 [!INCLUDE [common](dominant-speaker-common.md)]
 
 In order to use the Dominant Speakers call feature for Windows, the first step is to obtain the Dominant Speakers feature API object:
 
 ```csharp
-DominantSpeakersCallFeature dominantSpeakersFeature = (DominantSpeakersCallFeature)call.GetCallFeatureExtension(HandleType.DominantSpeakersCallFeature);
+DominantSpeakersCallFeature dominantSpeakersFeature = call.Features.DominantSpeakers;
 ```
 
 The Dominant Speakers feature object have the following API structure:
 - `OnDominantSpeakersChanged`: Event for listening for changes in the dominant speakers list.
 - `DominantSpeakersInfo`: Gets the `DominantSpeakersInfo` object. This object has:
     - `Speakers`: A list of participant identifiers representing the dominant speakers list.
-    - `Timestamp`: The date when the dominant speakers list was updated. 
+    - `LastUpdatedAt`: The date when the dominant speakers list was updated. 
 
 To subscribe to changes in the dominant speakers list:
 ```csharp
 // Obtain the extended feature object from the call object.
-DominantSpeakersFeature dominantSpeakersFeature = (DominantSpeakersCallFeature)call.GetCallFeatureExtension(HandleType.DominantSpeakersCallFeature);
+DominantSpeakersFeature dominantSpeakersFeature = call.Features.DominantSpeakers;
 // Subscribe to the OnDominantSpeakersChanged event.
 dominantSpeakersFeature.OnDominantSpeakersChanged += DominantSpeakersFeature__OnDominantSpeakersChanged;
 
 private void DominantSpeakersFeature__OnDominantSpeakersChanged(object sender, PropertyChangedEventArgs args) {
   // When the list changes, get the timestamp of the last change and the current list of Dominant Speakers
   DominantSpeakersInfo dominantSpeakersInfo = dominantSpeakersFeature.DominantSpeakersInfo;
-  DateTimeOffset date = dominantSpeakersInfo.Timestamp;
+  DateTimeOffset date = dominantSpeakersInfo.LastUpdatedAt;
   IReadOnlyList<ICommunicationIdentifier> speakersList = dominantSpeakersInfo.Speakers;
 }
 ```