[DNS] Document DNS record limit buffer

[dklbreitling]

Summary

Updates the DNS FAQ record limits section to clarify that DNS records created by Cloudflare services on behalf of a customer, such as Email Routing TXT and MX records, also count toward DNS record limits.

Also documents that these service-created records are enforced with a small buffer to avoid disrupting Cloudflare services, while customer-created records through the dashboard or API still require the zone to be within its record limit.

Screenshots (optional)

N/A

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

✅ No style-guide issues found in commit 6bae13a.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/dns/	@RebeccaTamachiro, @hannes-cf, @cloudflare/product-owners, @esomoza-cf, @fattouche, @xofyarg, @dklbreitling, @chreo, @svenr-cf, @kerolasa, @matildeopbravo, @vavrusa, @mworsley-cloudflare, @sebastiaanyn, @vendemiat, @Woutifier

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No issues found.

[ask-bonk]

Labels applied: product:dns, content:edit, size/xs.

The PR adds a concise clarification to the DNS FAQ record limits section, explaining that service-created records (such as Email Routing TXT/MX) count toward DNS record limits and are enforced with a small buffer to avoid disruption, while customer-created records still require the zone to remain within its limit. No issues found — the change is well-scoped, the internal link is valid, and there are no MDX syntax or style guide violations.

github run

[github-actions]

Preview URL: https://6bae13a2.preview.developers.cloudflare.com
Preview Branch URL: https://dbreitling-dns-13042-record-limit-buffer-docs.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/dns/faq/	https://dbreitling-dns-13042-record-limit-buffer-docs.preview.developers.cloudflare.com/dns/faq/