Merge branch 'connorgilbert/specify-advanced-sast-ruleset-source' into 'master'

Docs: Specify source of Advanced SAST ruleset

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167106



Merged-by: Russell Dickenson <rdickenson@gitlab.com>
Approved-by: Russell Dickenson <rdickenson@gitlab.com>
Reviewed-by: Connor Gilbert <cgilbert@gitlab.com>
Co-authored-by: Connor Gilbert <cgilbert@gitlab.com>