do more docs

src/structures/VoiceChannel.js

@@ -13,9 +13,31 @@ class VoiceChannel extends GuildChannel {
 
   setup(data) {
     super.setup(data);
+    /**
+     * The bitrate of this voice channel
+     * @type {Number}
+     */
     this.bitrate = data.bitrate;
+    /**
+     * The maximum amount of users allowed in this channel - 0 means unlimited.
+     * @type {Number}
+     */
     this.userLimit = data.user_limit;
   }
+
+  /**
+   * Sets the bitrate of the channel
+   * @param {Number} bitrate the new bitrate
+   * @returns {Promise<VoiceChannel>}
+   * @example
+   * // set the bitrate of a voice channel
+   * voiceChannel.setBitrate(48000)
+   *  .then(vc => console.log(`Set bitrate to ${vc.bitrate} for ${vc.name}`))
+   *  .catch(console.log);
+   */
+  setBitrate(bitrate) {
+    return this.rest.client.rest.methods.updateChannel(this, { bitrate });
+  }
 }
 
 module.exports = VoiceChannel;