[Rules, WAF] Clarify Error Pages

[pedrosousa]

Summary

Includes changes proposed in #21466, updated after the launch of the new Error Pages.

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PR Change Summary

Clarified terminology and references related to custom error pages in the documentation following the launch of new Error Pages.

• Updated references from 'Custom Error Pages' to 'Error Pages' for consistency.
• Clarified instructions for creating custom error pages for specific error types.
• Modified notes to enhance clarity regarding customization options for error pages.

Modified Files

• src/content/docs/rules/custom-errors/reference/error-tokens.mdx
• src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors.mdx
• src/content/docs/waf/reference/legacy/old-rate-limiting/index.mdx
• src/content/docs/waf/reference/migration-guides/firewall-rules-to-custom-rules.mdx
• src/content/partials/fundamentals/account-permissions-table.mdx

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Preview URL: https://a7ef1bf3.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/waf/reference/migration-guides/firewall-rules-to-custom-rules/	https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com/waf/reference/migration-guides/firewall-rules-to-custom-rules/
https://developers.cloudflare.com/rules/custom-errors/edit-error-pages/	https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com/rules/custom-errors/edit-error-pages/
https://developers.cloudflare.com/rules/custom-errors/reference/error-tokens/	https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com/rules/custom-errors/reference/error-tokens/
https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/	https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/
https://developers.cloudflare.com/waf/reference/legacy/old-rate-limiting/	https://pedro-2025-04-30-update-custom-pages.preview.developers.cloudflare.com/waf/reference/legacy/old-rate-limiting/