Update dns-zone-defaults.mdx

ENT customers may require the Authoritative DNS - Custom SOA Record Allowed Entitlement added to their Account to see have the options of editing the DNS Settings.
It is not enabled by default.

Author: vianaedson

src/content/docs/dns/additional-options/dns-zone-defaults.mdx

@@ -20,6 +20,7 @@ DNS zone defaults are only applied at the moment a new zone is created and will
 3. For **DNS zone defaults**, select **Configure defaults**.
 
 The values you select for the listed settings will be automatically applied to new zones as you add them to your Cloudflare account.
+If these options are not displayed in your Cloudflare Dashboard, you may need to reach out to [Cloudflare Support](https://developers.cloudflare.com/support/contacting-cloudflare-support/) to have them enabled.
 
 ## Available settings
 
@@ -35,4 +36,4 @@ For secondary zones:
 
 - [Secondary DNS override](/dns/zone-setups/zone-transfers/cloudflare-as-secondary/proxy-traffic/): Enable the options to use Cloudflare [proxy](/dns/manage-dns-records/reference/proxied-dns-records/) and add `CNAME` records at your zone apex.
 
-  Multi-provider DNS does not apply as a setting for secondary zones, as this is already a required behavior for this setup. `SOA` record and the `NS` record TTL are defined on your external DNS provider and only transferred into Cloudflare.
+  Multi-provider DNS does not apply as a setting for secondary zones, as this is already a required behavior for this setup. `SOA` record and the `NS` record TTL are defined on your external DNS provider and only transferred into Cloudflare.