Update status_uri description for health checking

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184272



Merged-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Naman Jagdish Gala <ngala@gitlab.com>
Co-authored-by: James Reed <jreed@gitlab.com>