Merge pull request #381 from Chris911/maintenance/about-page-code-sample

Update code sample on about page with ES6 features

locale/en/about/index.md

@@ -11,14 +11,17 @@ connections can be handled concurrently. Upon each connection the callback is
 fired, but if there is no work to be done Node is sleeping.
 
 ```javascript
-var http = require('http');
+const http = require('http');
 
-http.createServer(function (req, res) {
-  res.writeHead(200, {'Content-Type': 'text/plain'});
-  res.end('Hello World\n');
-}).listen(1337, '127.0.0.1');
+const hostname = '127.0.0.1';
+const post = 1337;
 
-console.log('Server running at http://127.0.0.1:1337/');
+http.createServer((req, res) => {
+  res.writeHead(200, { 'Content-Type': 'text/plain' });
+  res.end('Hello World\n');
+}).listen(post, hostname, () => {
+  console.log(`Server running at http://${hostname}:${post}/`);
+});
 ```
 
 This is in contrast to today's more common concurrency model where OS threads