flow3:doctrine:migrationgenerate should return better explanations
Generated new migration class to ...
the command output should read something like:
Generated new migration class! Next Steps: - Move ... to YourPackage/Migrations/Mysql/ - Review and adjust the generated migration. - (optional) execute the generated migration using ./flow3 doctrine:migrate
As this is much more understandable, and less error-prone, especially to new users.