doc: fix: docstring: use Promise

frontend/static/js/api/tournament/tournament.js

@@ -73,6 +73,10 @@ class Tourmanent
 		this.connected = false;
 	}
 
+	/**
+	 * 
+	 * @returns {Promise<?>}
+	 */
 	async init()
 	{
 		let response = await this.client._get(`/api/tournaments/${id}`);
@@ -108,6 +112,12 @@ class Tourmanent
 		this._socket.send(JSON.stringify({participate: ""}));
 	}
 
+	/**
+	 * Join the tournament Websocket
+	 * @param {CallableFunction} receive_func 
+	 * @param {CallableFunction} disconnect_func 
+	 * @returns {?}
+	 */
 	async join(receive_func, disconnect_func)
 	{
 		if (!await this.client.isAuthentificate())