Merge branch 'docs-spt-migrate' into 'master'

Docs: Add .com to SM migration section

See merge request gitlab-org/gitlab!33639

doc/user/project/import/index.md

@@ -47,6 +47,10 @@ Keep in mind the limitations of the [import/export feature](../settings/import_e
 You will still need to migrate your Container Registry over a series of
 Docker pulls and pushes and re-run any CI pipelines to retrieve any build artifacts.
 
+## Migrating from GitLab.com to self-managed GitLab
+
+The process is essentially the same as for [migrating from self-managed GitLab to GitLab.com](#migrating-from-self-managed-gitlab-to-gitlabcom). The main difference is that users can be created on the self-managed GitLab instance by an admin through the UI or the [users API](../../../api/users.md#user-creation).
+
 ## Migrating between two self-managed GitLab instances
 
 The best method for migrating from one GitLab instance to another,