[DNS] Remove secondary to primary limitation callout

[RebeccaTamachiro]

Summary

PCX-17291
As part of a previous effort (#17088), this should have been removed

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PR Change Summary

Updated the DNS documentation to clarify the limitations regarding secondary DNS zones.

• Removed the limitations section that stated secondary zones cannot be converted to primary zones.
• Clarified that secondary DNS is only available to Enterprise customers.

Modified Files

• src/content/docs/dns/zone-setups/zone-transfers/cloudflare-as-secondary/index.mdx

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[github-actions]

Preview URL: https://91116703.preview.developers.cloudflare.com
Preview Branch URL: https://rebecca-dns-fix-zone-conversion-callout.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/dns/zone-setups/zone-transfers/cloudflare-as-secondary/	https://rebecca-dns-fix-zone-conversion-callout.preview.developers.cloudflare.com/dns/zone-setups/zone-transfers/cloudflare-as-secondary/