A troubleshooting note was added in [a previous MR]
(https://gitlab.com/gitlab-org/gitlab/-/merge_requests/139606?pin=d1aaa41ca45245679946bb94064727b743af94d6#d1aaa41ca45245679946bb94064727b743af94d6_396_396), but this MR will add user management restriction notes to the core LDAP group sync documentation.