Add missing type

src/client/voice/VoiceConnection.js

@@ -26,8 +26,14 @@ class VoiceConnection extends EventEmitter {
      */
     this.voiceManager = pendingConnection.voiceManager;
 
+    /**
+     * @external Prism
+     * @see {@link https://github.com/hydrabolt/prism-media}
+     */
+
     /**
      * The audio transcoder for this connection
+     * @type {Prism}
      */
     this.prism = new Prism();