Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/misc/form.js

@@ -20,6 +20,7 @@
    * Retrieves the summary for the first element.
    *
    * @return {string}
+   *   The text of the summary.
    */
   $.fn.drupalGetSummary = function () {
     var callback = this.data('summaryCallback');
@@ -34,6 +35,7 @@
    *   retrieved or a string (which is returned each time).
    *
    * @return {jQuery}
+   *   jQuery collection of the current element.
    *
    * @fires event:summaryUpdated
    *
@@ -125,6 +127,7 @@
    * Sends a 'formUpdated' event each time a form element is modified.
    *
    * @param {HTMLElement} element
+   *   The element to trigger a form updated event on.
    *
    * @fires event:formUpdated
    */
@@ -136,8 +139,10 @@
    * Collects the IDs of all form fields in the given form.
    *
    * @param {HTMLFormElement} form
+   *   The form element to search.
    *
    * @return {Array}
+   *   Array of IDs for form fields.
    */
   function fieldsList(form) {
     var $fieldList = $(form).find('[name]').map(function (index, element) {
@@ -154,6 +159,11 @@
    *
    * @type {Drupal~behavior}
    *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches formUpdated behaviors.
+   * @prop {Drupal~behaviorDetach} detach
+   *   Detaches formUpdated behaviors.
+   *
    * @fires event:formUpdated
    */
   Drupal.behaviors.formUpdated = {
@@ -208,6 +218,9 @@
    * Prepopulate form fields with information from the visitor browser.
    *
    * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the behavior for filling user info from browser.
    */
   Drupal.behaviors.fillUserInfoFromBrowser = {
     attach: function (context, settings) {