Docs: Clarify that "admins" sometimes means Owners and sometimes Owners+Maintainers

[x] Start this issue's title with Docs: or Docs feedback:.

Problem to solve

• What product or feature(s) affected? Compliance frameworks docs
• What docs or doc section affected? Compliance frameworks docs
• Is there a problem with a specific document, or a feature/process that's not addressed sufficiently in docs? Yes, some Compliance Controls use the word "admin" in the control name (e.g. ensure_2_admins_per_repo) and the explanatory text also uses the word Admin but that is not a role in GitLab groups or projects.

Further details

N/a

Proposal

Update the docs to clearly indicate the actual GitLab roles that are checked.

Who can address the issue

Anyone can contribute 😄

Other links/references

First bit. Here, "admins" = owners. Relevant code is: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/compliance_management/compliance_requirements/project_fields.rb#L245-247

        def ensure_2_admins_per_repo?(project, _context = {})
          project.team.owners.count >= 2
        end

Second bit. Here, "admins" = owners + maintainers. Relevant code is: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/lib/compliance_management/compliance_requirements/project_fields.rb#L229-235

        def more_members_than_admins?(project, _context = {})
          team = project.team

          return true if team.members.count == 1

          team.members.count > (team.owners + team.maintainers).count
        end