docs: note apex domain handling for DNS records

customize/custom-domain.mdx

@@ -45,13 +45,19 @@
   Each domain provider has different ways to add DNS records. Refer to your domain provider's documentation for specific instructions.
 </Tip>
 
+<Note>
+  Some DNS providers, such as Namecheap and GoDaddy, automatically append your apex domain to whatever you enter in the **Name** field. If your provider does this, omit the apex domain suffix when pasting each record so it isn't duplicated.
+
+  For example, if your dashboard shows a record name like `_cf-custom-hostname.docs.example.com` and your domain is `example.com`, paste `_cf-custom-hostname.docs` instead of the full value. Providers like Cloudflare, Route 53, and DNSimple accept the fully-qualified value as shown.
+</Note>
+
 <Warning>
   If you migrate an existing domain and want zero downtime, add the verification `TXT` records before updating your `CNAME`. Then wait until SSL/TLS certificates pre-provision before cutting over. Switching the `CNAME` before certificates are issued causes HTTPS requests to fail until provisioning completes.
 </Warning>
 
 ### DNS propagation
 
 DNS changes typically take 1-24 hours to propagate globally, though it can take up to 48 hours in some cases. You can verify your DNS is configured correctly using [DNSChecker](https://dnschecker.org).
 
 Once your DNS records are active, your documentation is first accessible via HTTP. HTTPS is available after Vercel provisions your TLS certificate.
 
@@ -71,13 +77,13 @@
 
 ### Reserved paths
 
 The `/.well-known/acme-challenge` path is reserved for certificate validation and cannot be redirected or rewritten. If you have configured redirects or rewrites for this path, certificate provisioning fails.
 
 ### Provider-specific settings
 
 <AccordionGroup>
   <Accordion title="Vercel verification">
     If Vercel is your domain provider, you must add a verification `TXT` record. This information appears on your dashboard after submitting your custom domain, and is emailed to you.
   </Accordion>
 
   <Accordion title="Cloudflare encryption mode">

es/customize/custom-domain.mdx

@@ -43,6 +43,12 @@ CNAME | docs | cname.mintlify.builders
   Cada proveedor de dominios tiene diferentes formas de agregar registros DNS. Consulta la documentación de tu proveedor de dominios para obtener instrucciones específicas.
 </Tip>
 
+<Note>
+  Algunos proveedores de DNS, como Namecheap y GoDaddy, añaden automáticamente tu dominio apex a lo que ingreses en el campo **Name**. Si tu proveedor hace esto, omite el sufijo del dominio apex al pegar cada registro para que no se duplique.
+
+  Por ejemplo, si tu dashboard muestra un nombre de registro como `_cf-custom-hostname.docs.example.com` y tu dominio es `example.com`, pega `_cf-custom-hostname.docs` en lugar del valor completo. Proveedores como Cloudflare, Route 53 y DNSimple aceptan el valor totalmente calificado tal como se muestra.
+</Note>
+
 <Warning>
   Si estás migrando un dominio existente y quieres cero tiempo de inactividad, agrega los registros `TXT` de verificación antes de actualizar tu `CNAME` y espera a que los certificados SSL/TLS estén pre-provisionados antes de hacer el cambio. Cambiar el `CNAME` antes de que se emitan los certificados provoca que las solicitudes HTTPS fallen hasta que se complete el aprovisionamiento.
 </Warning>