Adds scenario to DNS records (cloudflare#23196)

Author: angelampcosta

src/content/docs/load-balancing/load-balancers/dns-records.mdx

@@ -47,6 +47,15 @@ This behavior only applies to [supported records](#supported-records) (determine
 
 :::
 
+If the DNS record points to a [SaaS provider](/cloudflare-for-platforms/cloudflare-for-saas/) and an active [custom hostname](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/) exists, the custom hostname will take precedence over the Load Balancing record:
+
+* **Scenario 4**:
+
+  * **CNAME**: `x.example.com` with target to a Cloudflare for SaaS provider
+  * **LB record**: `x.example.com`
+  * **Active custom hostname on the SaaS provider side**: `x.example.com`
+  * **Outcome**: Custom hostname takes precedence.
+
 ## Disabling a load balancer
 
 When you disable a load balancer, requests to a specific hostname depend on your existing DNS records: