[Speed] Applies APIRequest to Speed docs

[angelampcosta]

Summary

Applies APIRequest to Speed docs.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated Speed documentation to incorporate the APIRequest component for API examples.

• Replaced cURL examples with APIRequest components in Speed Brain documentation.
• Updated HTTP/2 to Origin documentation to use APIRequest for API examples.

Modified Files

• src/content/docs/speed/optimization/content/speed-brain.mdx
• src/content/docs/speed/optimization/protocol/http2-to-origin.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/speed/	@angelampcosta, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://078a6e26.preview.developers.cloudflare.com
Preview Branch URL: https://angela-api-speed.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/speed/optimization/protocol/http2-to-origin/	https://angela-api-speed.preview.developers.cloudflare.com/speed/optimization/protocol/http2-to-origin/
https://developers.cloudflare.com/speed/optimization/content/speed-brain/	https://angela-api-speed.preview.developers.cloudflare.com/speed/optimization/content/speed-brain/