Address comments

Author: minggangw

lib/action/client.js

@@ -374,7 +374,12 @@ class ActionClient extends Entity {
 
   /**
    * Get the number of wait set entities that make up an action entity.
-   * @return {object} - The number of subscriptions, guard_conditions, timers, and clients and services.
+   * @return {object} - An object containing the number of various entities.
+   * @property {number} subscriptionsNumber - The number of subscriptions.
+   * @property {number} guardConditionsNumber - The number of guard conditions.
+   * @property {number} timersNumber - The number of timers.
+   * @property {number} clientsNumber - The number of clients.
+   * @property {number} servicesNumber - The number of services.
    */
   getNumEntities() {
     return rclnodejs.getNumEntities(this.handle);