Merge branch 'docs-klang-add-scim-troubleshooting-activate-user' into 'master'

Add SCIM troubleshooting to reactivate an inactive user

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138395



Merged-by: Jon Glassman <jglassman@gitlab.com>
Co-authored-by: keelanlang <klang@gitlab.com>