[DNS] Fix DNS delegation wording (#27626)

* [DNS] Improve wording in update nameservers documentation

* Fix other occurrences

---------

Co-authored-by: Rebecca Tamachiro <[email protected]>

Author: matilde-cf

src/content/docs/dns/foundation-dns/setup.mdx

@@ -104,7 +104,7 @@ To enable advanced nameservers on an existing zone:
 
 2. Update the authoritative nameservers at your registrar. This step depends on whether you are using [Cloudflare Registrar](/registrar/):
    - If you are using Cloudflare Registrar, [contact Cloudflare Support](/support/contacting-cloudflare-support/) to have your nameservers updated.
-   - If you are using a different registrar or if your zone is delegated to a parent zone, [manually update your nameservers](/dns/nameservers/update-nameservers/#specific-processes).
+   - If you are using a different registrar or if your zone is delegated, [manually update your nameservers](/dns/nameservers/update-nameservers/#specific-processes).
 
      :::caution
 

src/content/docs/dns/nameservers/custom-nameservers/account-custom-nameservers.mdx

@@ -127,7 +127,7 @@ Use the endpoint [Update DNS Settings for a Zone](/api/resources/dns/subresource
 
 - If your domain uses [Cloudflare Registrar](/registrar/), [contact Cloudflare Support](/support/contacting-cloudflare-support/) to update your nameservers.
 - If your domain uses a different registrar, update the nameservers at your registrar to use the account custom nameservers.
-- If your zone is delegated to a parent zone, update the corresponding `NS` record at the parent zone.
+- If your zone is delegated, update the corresponding `NS` record at the parent zone.
 
 ### 3. (Optional) Make ACNS default for new zones
 

src/content/docs/dns/nameservers/update-nameservers.mdx

@@ -19,7 +19,7 @@ If you are using Cloudflare Registrar with [custom nameservers](/dns/nameservers
 
 ### Your domain uses a different registrar
 
-If you have acquired your domain from a [registrar](https://www.cloudflare.com/learning/dns/glossary/what-is-a-domain-name-registrar/) other than Cloudflare Registrar - and it has not been [delegated to another zone](#your-domain-is-delegated-to-another-zone) - you need to update your nameservers at your registrar.
+If you have acquired your domain from a [registrar](https://www.cloudflare.com/learning/dns/glossary/what-is-a-domain-name-registrar/) other than Cloudflare Registrar - and it has not been [delegated](#your-domain-is-delegated) - you need to update your nameservers at your registrar.
 
 <Render file="ns-update-providers" product="dns" />
 
@@ -36,9 +36,9 @@ In that case, you may have to update your nameservers in the reseller platform,
 Refer to [Squarespace documentation](https://support.squarespace.com/hc/articles/4404183898125-Nameservers-and-DNSSEC-for-Squarespace-managed-domains#toc-open-the-domain-s-advanced-settings) on how to update nameservers in their platform.
 :::
 
-### Your domain is delegated to another zone
+### Your domain is delegated
 
-If you are onboarding a subdomain `shop.example.com` as a [child domain](/dns/zone-setups/subdomain-setup/), it is expected that the child domain has been delegated to the parent domain.
+If you are onboarding a subdomain `shop.example.com` as a [child domain](/dns/zone-setups/subdomain-setup/), the parent domain (`example.com`) must delegate authority to the child domain.
 
 Delegation means that `shop.example.com` has specific `NS` records set up for it within the DNS records management of the parent zone (`example.com`).