Update simple.md (oven-sh#4881)

I have removed the / before ${server.port} because it its incorrect and I replaced the localhost to ${server.hostname}

Co-authored-by: Colin McDonnell <[email protected]>

Author: 2 people

docs/guides/websocket/simple.md

@@ -29,5 +29,5 @@ const server = Bun.serve<{ authToken: string }>({
   },
 });
 
-console.log(`Listening on localhost:${server.port}`);
+console.log(`Listening on ${server.hostname}:${server.port}`);
 ```