Fix `websocket_url` on the minimal WebSocket client example (#5885)

Co-authored-by: Fabio Alessandrelli <[email protected]>

tutorials/networking/websocket.rst

@@ -37,7 +37,7 @@ This example will show you how to create a WebSocket connection to a remote serv
     extends Node
 
     # The URL we will connect to
-    export var websocket_url = "ws://echo.websocket.org"
+    export var websocket_url = "wss://libwebsockets.org"
 
     # Our WebSocketClient instance
     var _client = WebSocketClient.new()
@@ -53,7 +53,7 @@ This example will show you how to create a WebSocket connection to a remote serv
         _client.connect("data_received", self, "_on_data")
 
         # Initiate connection to the given URL.
-        var err = _client.connect_to_url(websocket_url)
+        var err = _client.connect_to_url(websocket_url, ["lws-mirror-protocol"])
         if err != OK:
             print("Unable to connect")
             set_process(false)