doc (api) fix js docs for PersistenceItem

Author: vengrov

lib/server-code/api/persistence-item.js

@@ -52,38 +52,30 @@ class PersistenceItem {
     return promisify(this.dataStore.remove, this.dataStore)(this);
   }
 
-  loadRelations() {
-    const promisified = promisify(this.dataStore.remove, this.dataStore)(this);
-
-    return promisified.apply(null, [this].concat(Array.prototype.slice.call(arguments)));
+  /**
+   * @param {String[]=} options A list of relations to retrieve
+   * @returns {Promise}
+   */
+  loadRelations(options) {
+    return promisify(this.dataStore.remove, this.dataStore)(this, options);
   }
 
+  /**
+   * @private
+   */
   get dataStore() {
     return Backendless.Data.of(this.___class);
   }
 
+  /**
+   * @private
+   */
   static get dataStore() {
     return Backendless.Data.of(this.name);
   }
 
   /**
-   * @typedef {Object} DataQueryOptions
-   * @property {Number} pageSize
-   * @property {Number} offset
-   * @property {String} sortBy
-   * @property {Number} relationsDepth
-   * @property {String[]} relations
-   */
-
-  /**
-   * @typedef {Object} DataQuery
-   * @property {String[]} properties
-   * @property {String} condition WHERE clause condition
-   * @property {DataQueryOptions} options
-   */
-
-  /**
-   * @param {DataQuery} dataQuery
+   * @param {Backendless.DataQuery} dataQuery
    * @returns {Promise}
    */
   static find(dataQuery) {