Cleaned up surrounding documentation

    {}  # empty dictionary

A dictionary specifying the package where migration modules can be found on a per-app basis. The default value

of this setting is an empty dictionary, but the default package name for migration modules is ``migrations``.

A dictionary specifying the package where migration modules can be found on a

per-app basis. The default value of this setting is an empty dictionary, but

the default package name for migration modules is ``migrations``.

Example::

    {'blog': 'blog.db_migrations'}

In this case, migrations pertaining to the ``blog`` app will be contained in the ``blog.db_migrations`` package.

In this case, migrations pertaining to the ``blog`` app will be contained in

the ``blog.db_migrations`` package.

If you provide the ``app_label`` argument, :djadmin:`makemigrations` will

automatically create the package if it doesn't already exist.