[SSL] Update custom-metadata.mdx

[ngayerie]

Summary

Removing outdated limits, and removing mention to the page rules

[hyperlint-ai]

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PR Change Summary

Updated the custom metadata documentation to reflect the removal of outdated limits and references to page rules.

• Removed mention of outdated limits for Page Rules and Rate Limiting.
• Clarified the configuration process for per-hostname settings.

Modified Files

• src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/domain-support/custom-metadata.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/content/docs/cloudflare-for-platforms/cloudflare-for-saas/	@RebeccaTamachiro, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://2fdadfb8.preview.developers.cloudflare.com
Preview Branch URL: https://ngayerie-patch-18.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/custom-metadata/	https://ngayerie-patch-18.preview.developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/custom-metadata/