Fix Missing Highlights in Chapter 17 (#253)

* Include a line highlight and explanation for CharacterRegion.End

* Fixed line highlighting in Ch. 17, section Scene Management

* Undoing changes caused by user error

Author: EddyLuten

articles/tutorials/building_2d_games/17_scenes/index.md

@@ -93,7 +93,7 @@ With the Base scene implementation complete, we can now use it to create actual
 
 With the base `Scene` class defined, the `Core` class needs to be updated to handle management of the scenes, including update, drawing, and changing scenes.  Open the `Core.cs` file in the *MonoGameLibrary* project and make the following changes:
 
-[!code-csharp[](./snippets/core.cs?highlight=8,21-25,147–158,163–172,174–182,184–208)]
+[!code-csharp[](./snippets/core.cs?highlight=8,21-25,147-158,163-172,174-182,184-208)]
 
 The key changes here are: