Update composition-effects.md and fix compile

Author: lindexi

windows-apps-src/composition/composition-effects.md

@@ -205,10 +205,9 @@ LoadImage(surfaceBrush);
 
     ```cs
     var catVisual = _compositor.CreateSpriteVisual();
-      catVisual.Brush = catEffect;
-      catVisual.Size = new Vector2(219, 300);
-      _root.Children.InsertAtBottom(catVisual);
-    }
+    catVisual.Brush = catEffect;
+    catVisual.Size = new Vector2(219, 300);
+    _root.Children.InsertAtBottom(catVisual);    
     ```
 
 1. Create your image source to load.
@@ -239,4 +238,4 @@ LoadImage(surfaceBrush);
 - [Composition Brushes](composition-brushes.md)
 - [XamlCompositionBrushBase](/uwp/api/windows.ui.xaml.media.xamlcompositionbrushbase)
 - [Animation Overview](composition-animation.md)
-- [Composition native DirectX and Direct2D interoperation with BeginDraw and EndDraw](composition-native-interop.md)
+- [Composition native DirectX and Direct2D interoperation with BeginDraw and EndDraw](composition-native-interop.md)