Ticket #23778 -- Add a code snippet in the advanced testing documentatio...

...n showing how to run tests outside de test runner.
I think the Django testing code is not the best place to direct people looking for details - it contains all kinds of things that are quite specific to testing Django and are not useful for testing third-party apps.

Since this paragraph comes right after the settings file, I'd just say something like:

> Again, this is a minimal example; your tests may require additional settings to run.