Add jsdocs

modules/statistics/RTPStatsCollector.js

             calculatePacketLoss(lostPackets.upload, totalPackets.upload)
     };
     this.eventEmitter.emit(StatisticsEvents.CONNECTION_STATS, {
+            "bandwidth": this.conferenceStats.bandwidth,
             "bitrate": this.conferenceStats.bitrate,
             "packetLoss": this.conferenceStats.packetLoss,
-            "bandwidth": this.conferenceStats.bandwidth,
             "resolution": resolutions,
             "transport": this.conferenceStats.transport
         });

service/statistics/Events.js

 
 /**
  * Notifies about audio problem with remote participant.
+ *
+ * @param ssrc - The synchronization source identifier (SSRC) of the remote
+ * participant whose audio exhibits problems.
  */
 export const AUDIO_NOT_WORKING = "statistics.audio_not_working";
 
 /**
- * An event carrying connection statistics.
+ * An event carrying all statistics by ssrc.
  */
-export const CONNECTION_STATS = "statistics.connectionstats";
+export const BYTE_SENT_STATS = "statistics.byte_sent_stats";
 
 /**
- * An event carrying all statistics by ssrc.
+ * An event carrying connection statistics.
+ *
+ * @param {object} connectionStats - The connection statistics carried by the
+ * event such as <tt>bandwidth</tt>, <tt>bitrate</tt>, <tt>packetLoss</tt>,
+ * <tt>resolution</tt>, and <tt>transport</tt>.
  */
-export const BYTE_SENT_STATS = "statistics.byte_sent_stats";
+export const CONNECTION_STATS = "statistics.connectionstats";