[WAF]Update firewall-rules-to-custom-rules.mdx

[nenizera]

Hello team,

Summary

This is a zone level feature.

Thanks!

[hyperlint-ai]

Howdy and thanks for contributing to our repo. The Cloudflare team reviews new, external PRs within two (2) weeks. If it's been two weeks or longer without any movement, please tag the PR Assignees in a comment.

We review internal PRs within 1 week. If it's something urgent or has been sitting without a comment, start a thread in the Developer Docs space internally.

---

PR Change Summary

Updated the documentation for firewall rules to clarify customization options for error pages.

• Clarified the customization path for error pages in firewall rules.
• Updated the response description for WAF custom rules.

Modified Files

• src/content/docs/waf/reference/migration-guides/firewall-rules-to-custom-rules.mdx

---

How can I customize these reviews?

Check out the Hyperlint AI Reviewer docs for more information on how to customize the review.

If you just want to ignore it on this PR, you can add the hyperlint-ignore label to the PR. Future changes won't trigger a Hyperlint review.

Note specifically for link checks, we only check the first 30 links in a file and we cache the results for several hours (for instance, if you just added a page, you might experience this). Our recommendation is to add hyperlint-ignore to the PR to ignore the link check for this PR.

[pedrosousa]

Actually it's available both at the account and at the zone level.

Since we mention "zone" a few lines below, let's use also the zone context here.

[pedrosousa]

This PR was replaced by #22101.