[Security] Update protect-your-origin-server.mdx

[luishcardoso]

Hello team,

Summary

For further info on 5XX.

https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/

Thanks.

[cloudflare-docs-bot]

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✅ No issues found in commit c6de6d7.

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