[WAF] Update upgrade guides

[pedrosousa]

Summary

Addresses PCX-18374.
Updates the WAF upgrades guides since the API/resource sunset date is in the past.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated WAF upgrade guides to reflect the deprecation of older APIs and resources, ensuring users are informed about necessary migrations and changes in the dashboard.

• Clarified the deprecation status of Firewall Rules and related APIs, effective since 2025-06-15.
• Updated references to the new dashboard locations for custom rules and rate limiting rules.
• Emphasized the need for users to migrate to the Rulesets API for managing WAF custom rules and rate limiting rules.

Modified Files

• src/content/docs/waf/reference/legacy/firewall-rules-upgrade.mdx
• src/content/docs/waf/reference/legacy/old-rate-limiting/upgrade.mdx
• src/content/docs/waf/reference/legacy/old-waf-managed-rules/upgrade.mdx

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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/assets/images/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/docs/waf/	@pedrosousa, @cloudflare/firewall, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://9ef1cd0f.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-2025-07-15-waf-update-upgrade-guides.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/waf/reference/legacy/old-waf-managed-rules/upgrade/	https://pedro-2025-07-15-waf-update-upgrade-guides.preview.developers.cloudflare.com/waf/reference/legacy/old-waf-managed-rules/upgrade/
https://developers.cloudflare.com/waf/reference/legacy/firewall-rules-upgrade/	https://pedro-2025-07-15-waf-update-upgrade-guides.preview.developers.cloudflare.com/waf/reference/legacy/firewall-rules-upgrade/
https://developers.cloudflare.com/waf/reference/legacy/old-rate-limiting/upgrade/	https://pedro-2025-07-15-waf-update-upgrade-guides.preview.developers.cloudflare.com/waf/reference/legacy/old-rate-limiting/upgrade/