remove Account Custom Nameservers from Foundation DNS features

[Klintrup]

Summary

remove Account Custom Nameservers since it's not actually supported.

Ref: https://developers.cloudflare.com/dns/foundation-dns/advanced-nameservers/

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Removed reference to Account Custom Nameservers from the documentation as it is not supported.

• Removed the section on Account Custom Nameservers from the Foundation DNS documentation.
• Updated the list of additional DNS settings to reflect the removal.

Modified Files

• src/content/docs/dns/foundation-dns/index.mdx

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[RebeccaTamachiro]

Hello @Klintrup Thanks for reaching out.
Account custom nameservers is actually part of Foundation DNS. What the warning you noticed on the advanced nameservers docs is calling out is that currently you cannot use both (advanced nameservers and custom nameservers) at the same time.