Add missing event documentation and stability tags

src/ol/object.js

@@ -20,7 +20,17 @@ goog.require('ol.Observable');
  * @enum {string}
  */
 ol.ObjectEventType = {
+  /**
+   * Triggered before a property is changed.
+   * @event ol.ObjectEvent#beforepropertychange
+   * @todo stability experimental
+   */
   BEFOREPROPERTYCHANGE: 'beforepropertychange',
+  /**
+   * Triggered when a property is changed.
+   * @event ol.ObjectEvent#propertychange
+   * @todo stability experimental
+   */
   PROPERTYCHANGE: 'propertychange'
 };
 
@@ -99,7 +109,7 @@ ol.ObjectAccessor.prototype.transform = function(from, to) {
  * @constructor
  * @extends {ol.Observable}
  * @param {Object.<string, *>=} opt_values Values.
- * @fires ol.ObjectEvent
+ * @fires {@link ol.ObjectEvent} ol.ObjectEvent
  * @todo stability experimental
  */
 ol.Object = function(opt_values) {