Merge branch 'msj-confidential-issues' into 'master'

Formatting fixes for confidential issues doc

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117707



Merged-by: Catherine Pope <cpope@gitlab.com>
Approved-by: Catherine Pope <cpope@gitlab.com>
Co-authored-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>