Update start-level documentation for the sprite-library

SpriteLibrary/SpriteController.cs

@@ -94,8 +94,11 @@ namespace SpriteLibrary
 
     /// <summary>
     /// A sprite controller is the main heart of the sprite class.  Each SpriteController manages one picturebox.
-    /// If at all possible, try to keep each game in one picturebox, and try to avoid making and destroying
+    /// If at all possible, try to keep each game in one form, and try to avoid making and destroying
     /// new forms with SpriteController/pictureboxes in them.  It is hard to destroy them completely.
+    /// <para/>It is fairly simple to have multiple pictureboxes on one form.  You can <seealso cref="SpriteController.LinkControllersForSpriteTemplateSharing(SpriteController)">link</seealso> 
+    /// SpriteControllers, which allows sprite templates (Named Sprites) to be shared between controllers.  You can also use
+    /// a <seealso cref="SpriteDatabase"/> to define sprite templates which can be used across multiple PictureBoxes.
     /// </summary>
     /// <example>
     /// A sprite controller controls animations and