docs: add note about disabled DS016 check

[nikpivkin]

Description

./trivy image --scanners misconfig --image-config-scanners misconfig registry.access.redhat.com/ubi8/python-312:1-16.1721725207
2024-10-14T14:57:39+06:00       INFO    [image] Container image config scanners scanners=[misconfig]
2024-10-14T14:57:39+06:00       INFO    [misconfig] Misconfiguration scanning is enabled
2024-10-14T14:57:41+06:00       INFO    Check disabled  ID="DS016" scanner="history-dockerfile" reason="See https://github.com/aquasecurity/trivy/issues/7368"
...

Related PRs:

• fix(misconf): disable DS016 check for image history analyzer #7540

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

Can we add a prefix as below?

2024-10-14T14:57:41+06:00       INFO    [misconfig] Check disabled  ID="DS016" scanner="history-dockerfile" reason="See https://github.com/aquasecurity/trivy/issues/7368"

[DmitriyLewen]

This text looks nondescript. I assume users will simply skip this information.
Maybe we want to highlight it in a note/warning or make a table with rules disabled?
@knqyf263 wdyt?

[knqyf263]

Making a table sounds like a good idea, but I'm not sure we'll add more disabled checks. A table might be too much just for a single check.
I think it's enough as we're showing the logs, but using tables or bullet points would also be good. I'll leave it to you two.

[simar7]

I think it's fine as is. We can revisit it if we have more disabled checks in the future.