Update rewrite docs and cleanup

src/ReactorMaintenance.Win2D/MainWindow.xaml.cs

@@ -1,4 +1,4 @@
-using Microsoft.Graphics.Canvas;
+using Microsoft.Graphics.Canvas;
 using Microsoft.Graphics.Canvas.Text;
 using Microsoft.Graphics.Canvas.UI.Xaml;
 using Microsoft.UI;
@@ -717,4 +717,4 @@ public sealed partial class MainWindow
     private CanvasBitmap? m_RobotSprite;
     private CanvasBitmap? m_LeakSprite;
     private CanvasBitmap? m_HeatSprite;
-}
+}