Improve changeset

Author: ardatan

.changeset/curvy-insects-cheer.md

@@ -1,5 +1,16 @@
 ---
+'@whatwg-node/fetch': patch
 '@whatwg-node/node-fetch': patch
 ---
 
-Fix the bug when `set-cookies` given is ignored in `HeadersInit`
+Fix the bug when `set-cookies` given is ignored in `HeadersInit`;
+
+```js
+import { Headers } from '@whatwg-node/fetch';
+
+const headers = new Headers([
+    ['set-cookie', 'a=b'],
+    ['set-cookie', 'c=d'],
+]);
+expect(headers.getSetCookie()).toEqual(['a=b', 'c=d']); // Previously it was empty
+```