Feature Request: 5.6.0 Add Critical CVE Severity to support CVSS v3 scores 9.0-10.0

[venkateshjayagopal]

Is your feature request related to a problem?

Need to update the NV documentation regarding new admission control features
https://open-docs.neuvector.com/policy/admission

neuvector/neuvector#2260

Solution you'd like

Update documentation for new 5.6.0 feature.
https://open-docs.neuvector.com/policy/admission

Alternatives you've considered

No response

Anything else?

No response