Update nodes_and_scenes.rst

Fix the root node name.

getting_started/step_by_step/nodes_and_scenes.rst

@@ -58,7 +58,7 @@ you or a player runs the game.
 
 On top of acting like nodes, scenes have the following characteristics:
 
-1. They always have one root node, like the "Character" in our example.
+1. They always have one root node, like the "Player" in our example.
 2. You can save them to your local drive and load them later.
 3. You can create as many instances of a scene as you'd like. You could have
    five or ten characters in your game, created from your Character scene.