GameScene doesn't need Contnet using

Author: AristurtleDev

articles/tutorials/building_2d_games/17_scenes/snippets/gamescene.cs

@@ -2,7 +2,6 @@
 using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Audio;
-using Microsoft.Xna.Framework.Content;
 using Microsoft.Xna.Framework.Graphics;
 using Microsoft.Xna.Framework.Input;
 using MonoGameLibrary;