Add notes to mention permissions related to a DAST scan

What does this MR do and why?

Adds documentation notes to mention the permissions related to editing/viewing/deleting DAST scans and profiles.

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• #513374
• https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/4252

MR acceptance checklist

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Related to #513374