Merge pull request #3492 from harimohanraj89/doc-fix-3447

Added third return case documentation for `instance.changed()`

lib/instance.js

@@ -392,6 +392,8 @@ module.exports = (function() {
    *
    *
    * If changed is called without an argument, it will return an array of keys that have changed.
    * If changed is called without an argument, it will return an array of keys that have changed.
    *
    *
+   * If changed is called without an argument and no keys have changed, it will return `false`.
+   *
    * @param {String} [key]
    * @param {String} [key]
    * @return {Boolean|Array}
    * @return {Boolean|Array}
    */
    */