Merge branch 'dblessing_ms_group_sync_spec_comment' into 'master'

Add comment clarifying time travel

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/127024



Merged-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: Jessie Young <jessieyoung@gitlab.com>
Co-authored-by: Drew Blessing <drew@gitlab.com>