Update ExecuteOnUIThreadAsync to EnqueueAsync

Author: Panda-Sharp

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/DispatcherQueueHelper/DispatcherQueueHelperCode.bind

@@ -6,7 +6,7 @@ int crossThreadReturnedValue = await Task.Run<int>( async () =>
 	{
 		// Task.Run() will guarantee the given piece of code be executed on a separate thread pool. 
 		// This is used to simulate the scenario of updating the UI element from a different thread.
-		int returnedFromUIThread = await dispatcherQueue.ExecuteOnUIThreadAsync<int>(() =>
+		int returnedFromUIThread = await dispatcherQueue.EnqueueAsync<int>(() =>
 			{
 				NormalTextBlock.Text = "Updated from a random thread!";
 				return 1;
@@ -18,4 +18,4 @@ int crossThreadReturnedValue = await Task.Run<int>( async () =>
 	});
 
 
-NormalTextBlock.Text += $" And the value {crossThreadReturnedValue} was also returned successfully!";
+NormalTextBlock.Text += $" And the value {crossThreadReturnedValue} was also returned successfully!";