Fix typo in javadoc (thanks to Bob Jervis).

js/rhino/src/org/mozilla/javascript/Context.java

@@ -879,7 +879,7 @@ public class Context
      * @see java.beans.PropertyChangeEvent
      * @param  property  the bound property
      * @param  oldValue  the old value
-     * @param  newVale   the new value
+     * @param  newValue   the new value
      */
     final void firePropertyChange(String property, Object oldValue,
                                   Object newValue)