chore: (endpoints) update region tag in endpoints/getting-started/app.js (#3970)

* chore: (endpoints) update region tag in endpoints/getting-started/app.js

* chore: (endpoints) update region tag setup in endpoints/getting-started/app.js

---------

Co-authored-by: Jennifer Davis <[email protected]>

Author: hivanalejandro

endpoints/getting-started/app.js

@@ -15,6 +15,7 @@
 // [START endpoints_express_auth]
 'use strict';
 
+// [START endpoints_server_setup]
 // [START setup]
 const express = require('express');
 
@@ -25,6 +26,7 @@ app.set('case sensitive routing', true);
 // This middleware is available in Express v4.16.0 onwards
 app.use(express.json());
 // [END setup]
+// [END endpoints_server_setup]
 
 app.post('/echo', (req, res) => {
   res.status(200).json({message: req.body.message}).end();
@@ -43,13 +45,15 @@ app.get('/auth/info/googlejwt', authInfoHandler);
 app.get('/auth/info/googleidtoken', authInfoHandler);
 
 if (module === require.main) {
+  // [START endpoints_server_listen]
   // [START listen]
   const PORT = parseInt(process.env.PORT) || 8080;
   app.listen(PORT, () => {
     console.log(`App listening on port ${PORT}`);
     console.log('Press Ctrl+C to quit.');
   });
   // [END listen]
+  // [END endpoints_server_listen]
 }
 // [END endpoints_express_auth]