Merge branch 'russell/improve-enable-dast-instructions' into 'master'

Improve DAST enablement instructions

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/106267



Merged-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Cameron Swords <cswords@gitlab.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Co-authored-by: Russell Dickenson <rdickenson@gitlab.com>