[ai-gateway] clarify authentication behavior for Worker bindings

[leo-ars]

clarify that cf-aig-authorization header is not required for Worker bindings

Summary

Requests made via Cloudflare Worker bindings are pre-authenticated and do not require
manual inclusion of the cf-aig-authorization header. This note helps clarify internal
vs external request behavior when using Authenticated Gateway.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Clarified authentication behavior for Worker bindings in the AI Gateway documentation.

• Specified that the cf-aig-authorization header is not required for Worker bindings.
• Noted that requests made via bindings are pre-authenticated within the Cloudflare account.

Modified Files

• src/content/docs/ai-gateway/configuration/authentication.mdx

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