[1.7.x] Fixed #24337 - Added stronger documentation warning about automatic fake-initial.

  migration directories and make new initial migrations in the new format.

* Run ``python manage.py migrate``. Django will see that the tables for the

  initial migrations already exist and mark them as applied without running

  them.

  them. (Only matching table names are checked; not their full schema - it's up

  to you to make sure the existing schema is up to date with your models!)

That's it! The only complication is if you have a circular dependency loop

of foreign keys; in this case, ``makemigrations`` might make more than one