[DNS Firewall] Update instructions regarding PTR records on DNS Firewall cluster (#18563)

* Update instructions regarding PTR records on DNS Firewall cluster

* Adjust sentence for readability keeping 'point to' as per PM review

Author: RebeccaTamachiro

src/content/docs/dns/dns-firewall/faq.mdx

@@ -59,6 +59,9 @@ Yes. The default TTL is 30 seconds. You can set `negative_cache_ttl` via the [AP
 
 <Details header="How can I set PTR records for nameserver hostnames?">
 
-If you want PTR records on the assigned DNS Firewall cluster IPs that point to your nameserver hostnames, please reach out to your Cloudflare account team.
+To set up PTR records for the DNS Firewall cluster IPs that point to your nameserver hostnames, use the following API endpoints:
+
+- [Show DNS Firewall Cluster Reverse DNS](/api/operations/dns-firewall-show-dns-firewall-cluster-reverse-dns)
+- [Update DNS Firewall Cluster Reverse DNS](/api/operations/dns-firewall-update-dns-firewall-cluster-reverse-dns)
 
 </Details>