fix: use correct jsdoc types for params and methods

modules/statistics/CallStats.js

      * the <tt>userID</tt> aka endpoint ID, see CallStats docs for more info.
      * @param {string} options.userName the <tt>userName</tt> part of
      * the <tt>userID</tt> aka display name, see CallStats docs for more info.
-     * @param {String} options.configParams the set of parameters
+     * @param {object} options.configParams the set of parameters
      * to enable/disable certain features in the library. See CallStats docs for more info.
      *
      */

modules/statistics/SpeakerStatsCollector.js

      *
      * @returns {Object} The keys are the user ids and the values are the
      * associated user's SpeakerStats model.
-     * @private
      */
     getStats() {
         return this.stats.users;