updated comments

Author: luwangshell

comments.js

@@ -1,5 +1,8 @@
-// create web server Hello World app
+// Create web server Hello World app
 const http = require('http');
 const server = http.createServer((req, res) => {
     res.end('Hello World');
 });
+server.listen(3000, () => {
+    console.log('Server is listening on port 3000');
+});