Add documentation formatter for RSpec
Closes: #3831 (closed)
A build error without this change: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/105497419
One with this change: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/105496031
Closes: #3831 (closed)
A build error without this change: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/105497419
One with this change: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/105496031