Update DNS page

Removed references to no longer used tooling

source/standards/dns-hosting.html.md.erb

@@ -1,6 +1,6 @@
 ---
 title: How to manage DNS records for your service
-last_reviewed_on: 2022-07-14
+last_reviewed_on: 2024-02-21
 review_in: 12 months
 ---
 
@@ -24,13 +24,10 @@ When you implement your DNS strategy you should consider using:
 
 * [Amazon Route 53][] as a cloud DNS web service
 * [Google Cloud DNS][] for high nameserver availability
-* version control to publish your records using tools such as [GOV.UK DNS][] or [octoDNS][]
 
 You can read more about [service domains and DNS][] in the Service Manual.
 
 [Service Manual]: https://www.gov.uk/service-manual/technology/get-a-domain-name#choose-where-youll-host-your-dns
 [Amazon Route 53]: https://aws.amazon.com/route53/
 [Google Cloud DNS]: https://cloud.google.com/dns/
-[GOV.UK DNS]: https://github.com/alphagov/govuk-dns
-[octoDNS]: https://github.com/octodns/octodns
 [service domains and DNS]: https://www.gov.uk/service-manual/technology/get-a-domain-name