fix(chore) typos and jsdoc

modules/RTC/TraceablePeerConnection.js

 
 /**
  * Track the SSRCs seen so far.
- * @param {int} ssrc - SSRC.
+ * @param {number} ssrc - SSRC.
  * @return {boolean} - Whether this is a new SSRC.
  */
 TraceablePeerConnection.prototype.addRemoteSsrc = function(ssrc) {

modules/statistics/SpeakerStats.js

     /**
      * Returns true if the tracked user is currently a dominant speaker.
      *
-     * @param {boolean} - If true, the user will being accumulating time
+     * @param {boolean} isNowDominantSpeaker - If true, the user will be accumulating time
      * as dominant speaker. If false, the user will not accumulate time
      * and will record any time accumulated since starting as dominant speaker.
      * @param {boolean} silence - Indecates whether the dominant speaker is silent or not.

modules/xmpp/RoomMetadata.ts

     /**
      * Sets metadata for the given key.
      *
-     * @param {string} key - key under which the  metadata will be stored.
+     * @param {string} key - key under which the metadata will be stored.
      * @param {object} data - data to be stored.
      */
     setMetadata(key, data) {