[Docs] Threat score follow up changes

[Maddy-Cloudflare]

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PR Change Summary

Updated threat score documentation and security level descriptions to reflect recent changes in Cloudflare's security features.

• Replaced the security level description with updated security levels.
• Changed the threat score definition to indicate it is now always zero.
• Removed references to the previous threat score range and its implications.

Modified Files

• src/content/docs/waf/tools/security-level.mdx
• src/content/partials/waf/security-level-scores.mdx
• src/content/partials/waf/threat-score-definition.mdx

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[github-actions]

Preview URL: https://ac39500c.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-security-center-pcx-16455.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/waf/tools/security-level/	https://maddy-security-center-pcx-16455.preview.developers.cloudflare.com/waf/tools/security-level/