[CF1] RBI http support

[deadlypants1973]

Summary

PCX-17112

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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.

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PR Change Summary

Added information regarding HTTP support for RBI in the documentation.

• Introduced a new section on protocol support for RBI.
• Clarified that HTTP support is not planned for RBI.

Modified Files

• src/content/docs/cloudflare-one/policies/browser-isolation/known-limitations.mdx

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[github-actions]

Preview URL: https://e68be143.preview.developers.cloudflare.com
Preview Branch URL: https://kate-fixes-httprbi.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/policies/browser-isolation/known-limitations/	https://kate-fixes-httprbi.preview.developers.cloudflare.com/cloudflare-one/policies/browser-isolation/known-limitations/

[cdisher]

I would just state "Browser Isolation does not support HTTP at this time."

Don't want to say we'd never add support so prefer to be short and sweet here :)