Removed scale enum in TimeStep

lib/timeline/TimeStep.js

@@ -229,11 +229,9 @@ TimeStep.prototype.getCurrent = function() {
  * For example setScale(SCALE.MINUTES, 5) will result
  * in minor steps of 5 minutes, and major steps of an hour.
  *
- * @param {TimeStep.SCALE} newScale
- *                               A scale. Choose from SCALE.MILLISECOND,
- *                               SCALE.SECOND, SCALE.MINUTE, SCALE.HOUR,
- *                               SCALE.WEEKDAY, SCALE.DAY, SCALE.MONTH,
- *                               SCALE.YEAR.
+ * @param {string} newScale
+ *                               A scale. Choose from 'millisecond, 'second,
+ *                               'minute', 'hour', 'weekday, 'day, 'month, 'year'.
  * @param {Number}     newStep   A step size, by default 1. Choose for
  *                               example 1, 2, 5, or 10.
  */