Update NIST 800-171 version to v3 as Cloud Security already supports it

[komoken-dd]

What does this PR do? What is the motivation?

Cloud Security Misconfigurations already supports NIST 800-171 Rev. 3 (as shown in the UI), but the documentation still lists v2. This PR updates the supported version and reference link to match the current state.

Merge instructions

Merge readiness:

• Ready for merge

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AI assistance

Used Claude Code for research and identifying the discrepancy between the UI and documentation.

Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/kenta.komoriya/fix-nist-800-171-version/security/cloud_security_management/misconfigurations/frameworks_and_benchmarks/supported_frameworks