Update Scene.html

it's -> its

docs/api/scenes/Scene.html

@@ -34,7 +34,7 @@
 		
 		<h3>.[page:boolean autoUpdate]</h3>
 		<div>
-		Default is true. If set, then the renderer checks every frame if the scene and it's objects needs matrix updates. 
+		Default is true. If set, then the renderer checks every frame if the scene and its objects needs matrix updates. 
 		When it isn't, then you have to maintain all matrices in the scene yourself.  
 		</div>