chore: add code example

Co-authored-by: M. Heide <[email protected]>

en/guide/migrating-5.md

@@ -163,6 +163,16 @@ The `express.urlencoded` method makes the `extended` option `false` by default.
 <h4 id="app.listen">app.listen</h4>
 
 In Express 5, the `app.listen` method will invoke the user-provided callback function (if provided) when the server receives an error event. In Express 4, such errors would be thrown. This change shifts error-handling responsibility to the callback function in Express 5.
+Example:
+
+```js
+const server = app.listen(8080, '0.0.0.0', (error) => {
+	if (error) {
+		throw error; // e.g. EADDRINUSE
+	}
+	console.log('Listening on ' + JSON.stringify(server.address()));
+});
+```
 
 <h4 id="app.router">app.router</h4>