Merge branch 'docs-health-check-assign' into 'master'

Move Health Check page to Monitor group

See merge request gitlab-org/gitlab!72345

doc/user/admin_area/monitoring/health_check.md

 ---
-stage: none
-group: unassigned
+stage: Monitor
+group: Monitor
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
-type: concepts, howto
 ---
 
 # Health Check **(FREE SELF)**