Merge branch 'docs-variables-dropdown-details' into 'master'

Expand yaml reference for yaml options and value

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/108958



Merged-by: Andrew Fontaine <afontaine@gitlab.com>
Approved-by: Mireya Andres <mandres@gitlab.com>
Approved-by: Evan Read <eread@gitlab.com>
Approved-by: Andrew Fontaine <afontaine@gitlab.com>
Reviewed-by: Evan Read <eread@gitlab.com>
Reviewed-by: Mireya Andres <mandres@gitlab.com>
Reviewed-by: Catherine Pope <cpope@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>
Co-authored-by: Marcel Amirault <mamirault@gitlab.com>