[Fundamentals] Update cloudflare-ray-id.mdx

[ngayerie]

PCX-15982

[hyperlint-ai]

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PR Change Summary

Updated the Cloudflare Ray ID documentation to enhance clarity and provide additional context.

• Added information about the request header 'cf-ray' and its usage.
• Included instructions on how to find Ray IDs using Developer Tools or curl.
• Emphasized that Ray IDs are not guaranteed to be unique for every request.

Modified Files

• src/content/docs/fundamentals/reference/cloudflare-ray-id.mdx

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