[Rules] Changelog for DNS validation (#16977)

* [Rules] Changelog for DNS validation

* Apply suggestions from PCX review

---------

Co-authored-by: Pedro Sousa <[email protected]>

Author: nikitacano

src/content/changelogs/rules.yaml

@@ -5,6 +5,11 @@ productLink: "/rules/"
 productArea: Application performance
 productAreaLink: /fundamentals/reference/changelog/performance/
 entries:
+  - publish_date: "2024-09-20" 
+    title: Automatic DNS Validation for Cloudflare Rules
+    description: |- 
+      The Cloudflare dashboard now automatically validates [DNS records](/dns/manage-dns-records/reference/proxied-dns-records/) and [Cloudflare for SaaS custom hostnames](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/) for rules targeting specific hostnames or URLs. To prevent misconfigured rules and ensure smoother deployments, you will get proactive warnings for missing or misconfigured DNS records and custom hostnames.
+      
   - publish_date: "2024-09-17"
     title: Compression Rules available to all plans with Zstandard support
     description: |-