Move single-endpoint note under Step 3 heading

Agent-Logs-Url: https://github.com/ngrok/ngrok-docs/sessions/9a5bbb71-7f4b-493b-bbd9-bdaf6313b584

Co-authored-by: kaganjd <9204835+kaganjd@users.noreply.github.com>

Author: Copilot

using-ngrok-with/websockets.mdx

@@ -43,10 +43,10 @@ wss.on('connection', (ws) => {
 server.listen(8000);
 ```
 
-A single ngrok endpoint handles traffic for both protocols.
-
 ## 3. Start ngrok
 
+A single ngrok endpoint handles traffic for both protocols.
+
 ```sh
 ngrok http 8000
 ```