Added some missing @param and @throws Javadoc comments.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/ui/MenuButton.java

@@ -146,11 +146,13 @@ public class MenuButton {
 
 	/**
 	 * Sets a new center x coordinate.
+	 * @param x the x coordinate
 	 */
 	public void setX(float x) { this.x = x; }
 
 	/**
 	 * Sets a new center y coordinate.
+	 * @param y the y coordinate
 	 */
 	public void setY(float y) { this.y = y; }