docs: add abort controller example (#7287)

Co-authored-by: Jay <jasonsaayman@gmail.com>

examples/abort-controller/server.js

@@ -0,0 +1,16 @@
+import url from 'url';
+
+export default function (req, res) {
+  const parsedUrl = url.parse(req.url, true);
+  const delay = parsedUrl.query.delay || 3000;
+
+  setTimeout(() => {
+    res.writeHead(200, {
+      'Content-Type': 'text/json'
+    });
+    res.write(JSON.stringify({
+      message: 'Response completed successfully after ' + delay + 'ms'
+    }));
+    res.end();
+  }, delay);
+};