Doc: Terminology about packages

[buhtz]

This is about rational.rst where you say on the second bullet point.

• Subpackages are automatically included: you only need to specify the top-level package.

It is not clear (for me) to what kind of packages you referring to. With "top-level package" do you mean Distribution Packages and with "subpackages" do you mean Import Packages?

[takluyver]

I'm talking about import packages in both cases. A top-level package is one like django, a subpackage is like django.db or even django.db.models.sql - i.e. subfolders inside a package.