Fixed Rectangle.pad parameter docs. Thanks @ruslan-simonenko

Author: Lanny McNie

src/easeljs/geom/Rectangle.js

@@ -143,8 +143,8 @@ this.createjs = this.createjs||{};
 	 * @method pad
 	 * @param {Number} top
 	 * @param {Number} left
-	 * @param {Number} right
 	 * @param {Number} bottom
+	 * @param {Number} right
 	 * @return {Rectangle} This instance. Useful for chaining method calls.
 	 * @chainable
 	*/