[Rules] Update snippets example (#26244)

Author: pedrosousa

src/content/docs/rules/snippets/examples/override-set-cookies-value.mdx

@@ -20,10 +20,8 @@ export default {
 		const newHeaders = new Headers(response.headers);
 
 		// Get all Set-Cookie headers
-		const cookies = response.headers.get("Set-Cookie");
-		if (cookies) {
-			// Split the Set-Cookie headers
-			const cookieArray = cookies.split(/,(?=\s*[^;]+=[^;]+)/g);
+		const cookieArray = response.headers.getSetCookie();
+		if (cookieArray.length > 0) {
 			const updatedCookies = cookieArray.map((cookie) => {
 				// For example, replace the currency value with GBP
 				if (cookie.trim().startsWith("currency=")) {