fixup! Do not call django.setup() multiple times

[ci skip]

docs/configuring_django.rst

@@ -83,13 +83,14 @@ This can be done from your project's ``conftest.py`` file::
     def pytest_configure():
         settings.configure(DATABASES=...)
 
-Changing your app before Django gets setup
-------------------------------------------
+Changing your app before Django gets set up
+-------------------------------------------
 
 pytest-django calls :py:func:`django.setup` automatically.  If you want to do
 anything before this, you have to create a pytest plugin and use
 the :py:func:`~_pytest.hookspec.pytest_load_initial_conftests` hook, with
-``tryfirst=True``::
+``tryfirst=True``, so that it gets run before the hook in pytest-django
+itself::
 
     @pytest.hookimpl(tryfirst=True)
     def pytest_load_initial_conftests(early_config, parser, args):