[CNI] Connection types and limitations

[marciocloudflare]

Summary

Closes PCX-17293

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Enhanced the documentation for Direct CNI by adding details on supported connection types and limitations.

• Added a section on supported connection types for Direct CNI.
• Outlined limitations for Direct CNI's dedicated ports.
• Clarified use cases for Direct CNI in relation to Cloudflare services.

Modified Files

• src/content/docs/network-interconnect/express-cni/index.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/network-interconnect/	@marciocloudflare, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://0d8f64b0.preview.developers.cloudflare.com
Preview Branch URL: https://marcio-pcx17293-cni-reqs.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/network-interconnect/express-cni/	https://marcio-pcx17293-cni-reqs.preview.developers.cloudflare.com/network-interconnect/express-cni/

[deadlypants1973]

space between the 1 and Q?

[marciocloudflare]

You mean if there's a space? No. It's the name of a networking standard