Merge branch 'fix-migration-style-guide-required-upgrade-stop-wording' into 'master'

Update required stop wording in migration style guide

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/163223



Merged-by: Andy Schoenen <asoiron@gitlab.com>
Approved-by: Dominic Bauer <dbauer@gitlab.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>