fix(conference) Update JSDoc for JitsiConference:setReceiverConstraints()

JitsiConference.js

 /**
  * Sets the constraints for the video that is requested from the bridge.
  *
- * @param {Object} videoConstraints The constraints which are specified in the
- * following format. The message updates the fields that are present and leaves the
- * rest unchanged on the bridge. Therefore, any field that is not applicable anymore
- * should be cleared by passing an empty object or list (whatever is applicable).
+ * @param {Object} videoConstraints The constraints which are specified in the following format. The message updates
+ * the fields that are present and leaves the rest unchanged on the bridge. Therefore, any field that is not applicable
+ * anymore should be cleared by passing an empty object or list (whatever is applicable).
  * {
  *      'lastN': 20,
- *      'selectedEndpoints': ['A', 'B', 'C'],
- *      'onStageEndpoints': ['A'],
+ *      'selectedSources': ['A', 'B', 'C'],
+ *      'onStageSources': ['A'],
  *      'defaultConstraints': { 'maxHeight': 180 },
  *      'constraints': {
  *          'A': { 'maxHeight': 720 }
  *      }
  * }
+ * Where A, B and C are source-names of the remote tracks that are being requested from the bridge.
  */
 JitsiConference.prototype.setReceiverConstraints = function(videoConstraints) {
     this.receiveVideoController.setReceiverConstraints(videoConstraints);