Changed example code in CubicBezierCurve to use Vector2s

docs/api/extras/curves/CubicBezierCurve.html

@@ -22,10 +22,10 @@
 
 <code>
 var curve = new THREE.CubicBezierCurve(
-	new THREE.Vector3( -10, 0, 0 ),
-	new THREE.Vector3( -5, 15, 0 ),
-	new THREE.Vector3( 20, 15, 0 ),
-	new THREE.Vector3( 10, 0, 0 )
+	new THREE.Vector2( -10, 0, 0 ),
+	new THREE.Vector2( -5, 15, 0 ),
+	new THREE.Vector2( 20, 15, 0 ),
+	new THREE.Vector2( 10, 0, 0 )
 );
 
 var path = new THREE.Path( curve.getPoints( 50 ) );