[DNS] Add caveat and recommendation to vendor-specific-records

[RebeccaTamachiro]

Summary

PCX-10733

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PR Change Summary

Added a cautionary note and recommendation regarding CNAME records in vendor-specific DNS documentation.

• Introduced a caution note about CNAME and bucket name matching in AWS documentation.
• Recommended using a host header origin rule for routing requests to the correct bucket.

Modified Files

• src/content/docs/dns/manage-dns-records/reference/vendor-specific-records.mdx

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[github-actions]

Preview URL: https://d2c44b9f.preview.developers.cloudflare.com
Preview Branch URL: https://rebecca-dns-support-s3-caveat.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/dns/manage-dns-records/reference/vendor-specific-records/	https://rebecca-dns-support-s3-caveat.preview.developers.cloudflare.com/dns/manage-dns-records/reference/vendor-specific-records/