fix(samples): Rename dopes tests

Author: jeromelaban

src/SamplesApp/UITests.Shared/Windows_UI_Xaml/Performance/Performance_Dopes.xaml.cs

@@ -23,7 +23,7 @@ namespace UITests.Windows_UI_Xaml.Performance
 	/// <summary>
 	/// An empty page that can be used on its own or navigated to within a Frame.
 	/// </summary>
-	[SampleControlInfo("Performance", "MarkupExtension")]
+	[SampleControlInfo("Performance", "Dopes")]
 	public sealed partial class Performance_Dopes : Page
 	{
 		volatile bool breakTest = false;