Reflect experimental checks in `checks.yaml`

[dvcorreia]

Is your feature request related to a problem? Please describe.
From checks.yaml is not possible to infer which security checks are behind the experimental environment variable.

Describe the solution you'd like
This could be integrated into checks.yaml and the generated markdown documentation.

[dvcorreia]

This would be useful to us, so I would be happy to work on this.

[spencerschrock]

Thanks Diogo, happy to review any PR for this issue.