Update OrbitControls.html

docs/examples/controls/OrbitControls.html

@@ -190,9 +190,9 @@ controls.keys = {
 			This object contains references to the mouse buttons used for the controls.
 			<code>
 controls.mouseButtons = {
-	ORBIT: THREE.MOUSE.LEFT,
-	ZOOM: THREE.MOUSE.MIDDLE,
-	PAN: THREE.MOUSE.RIGHT
+	LEFT: THREE.MOUSE.LEFT,
+	MIDDLE: THREE.MOUSE.MIDDLE,
+	RIGHT: THREE.MOUSE.RIGHT
 }
 			</code>
 		</p>