docs: fix variable name in commented out code (app --> server)

Author: gkalpak

integration/express-engine-ivy-prerender/server.ts

@@ -23,7 +23,7 @@ export function app() {
   server.set('views', distFolder);
 
   // Example Express Rest API endpoints
-  // app.get('/api/**', (req, res) => { });
+  // server.get('/api/**', (req, res) => { });
   // Serve static files from /browser
   server.get('*.*', express.static(distFolder, {
     maxAge: '1y'

integration/express-engine-ivy/server.ts

@@ -23,7 +23,7 @@ export function app() {
   server.set('views', distFolder);
 
   // Example Express Rest API endpoints
-  // app.get('/api/**', (req, res) => { });
+  // server.get('/api/**', (req, res) => { });
   // Serve static files from /browser
   server.get('*.*', express.static(distFolder, {
     maxAge: '1y'

integration/express-engine-ve/server.ts

@@ -23,7 +23,7 @@ export function app() {
   server.set('views', distFolder);
 
   // Example Express Rest API endpoints
-  // app.get('/api/**', (req, res) => { });
+  // server.get('/api/**', (req, res) => { });
   // Serve static files from /browser
   server.get('*.*', express.static(distFolder, {
     maxAge: '1y'

modules/builders/testing/hello-world-app/server.ts

@@ -21,7 +21,7 @@ export function app() {
   server.set('views', distFolder);
 
   // Example Express Rest API endpoints
-  // app.get('/api/**', (req, res) => { });
+  // server.get('/api/**', (req, res) => { });
   // Serve static files from /browser
   server.get('*.*', express.static(distFolder, {
     maxAge: '1y'

modules/express-engine/README.md

@@ -12,6 +12,8 @@ To use it, set the engine and then route requests to it
 import * as express from 'express';
 import { ngExpressEngine } from '@nguniversal/express-engine';
 
+const app = express();
+
 // Set the engine
 app.engine('html', ngExpressEngine({
   bootstrap: ServerAppModule // Give it a module to bootstrap

modules/express-engine/schematics/install/files/__serverFileName@stripTsExtension__.ts

@@ -23,7 +23,7 @@ export function app() {
   server.set('views', distFolder);
 
   // Example Express Rest API endpoints
-  // app.get('/api/**', (req, res) => { });
+  // server.get('/api/**', (req, res) => { });
   // Serve static files from /browser
   server.get('*.*', express.static(distFolder, {
     maxAge: '1y'