Automatically rescheduled issues to 12.2

The following were rescheduled because the previous milestone was already closed:

1. https://gitlab.com/gitlab-org/gitlab-ee/issues/3079 Set the actual upgrade_url in license_helper frontend
2. https://gitlab.com/gitlab-org/gitlab-ee/issues/2040 Document how developers can restrict a feature to a specific subscription level ~"Accepting merge requests", ~"Documentation"
3. https://gitlab.com/gitlab-org/gitlab-ee/issues/125 Update and documentation LDAP sync configuration ~"Accepting merge requests", ~"Documentation", ~"docs-todo"

Please reschedule accordingly if they're wrong.