[Logs] Update firewall_events.md

[nenizera]

Hello,

Summary

Ray ID as per its docs https://developers.cloudflare.com/fundamentals/reference/cloudflare-ray-id/

Thanks!

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PR Change Summary

Updated the documentation for Ray ID in the firewall events section to improve clarity and provide a direct link to the relevant documentation.

• Clarified the description of Ray ID in the firewall events documentation.
• Updated the formatting of the Ray ID section for consistency.
• Added a link to the Cloudflare Ray ID documentation.

Modified Files

• src/content/docs/logs/reference/log-fields/zone/firewall_events.md

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[soheiokamoto]

This change needs to be done on the field template on the internal repo.

Also, you can update the field description, but not the field name (with a whitespace).