Fixed #20177 - Corrected docs for django.test.utils.setup_test_environment.

Thanks vlad.london.uk@ for the report.

docs/intro/tutorial05.txt

@@ -326,6 +326,13 @@ in the shell::
     >>> from django.test.utils import setup_test_environment
     >>> setup_test_environment()
 
+:meth:`~django.test.utils.setup_test_environment` installs a template renderer
+which will allow us to examine some additional attributes on responses such as
+``response.context`` that otherwise wouldn't be available. Note that this
+method *does not* setup a test database, so the following will be run against
+the existing database and the output may differ slightly depending on what
+polls you already created.
+
 Next we need to import the test client class (later in ``tests.py`` we will use
 the :class:`django.test.TestCase` class, which comes with its own client, so
 this won't be required)::

docs/topics/testing/advanced.txt

@@ -163,10 +163,12 @@ environment first. Django provides a convenience method to do this::
     >>> from django.test.utils import setup_test_environment
     >>> setup_test_environment()
 
-This convenience method sets up the test database, and puts other
-Django features into modes that allow for repeatable testing.
+:func:`~django.test.utils.setup_test_environment` puts several Django features
+into modes that allow for repeatable testing, but does not create the test
+databases; :func:`django.test.simple.DjangoTestSuiteRunner.setup_databases`
+takes care of that.
 
-The call to :meth:`~django.test.utils.setup_test_environment` is made
+The call to :func:`~django.test.utils.setup_test_environment` is made
 automatically as part of the setup of ``./manage.py test``. You only
 need to manually invoke this method if you're not using running your
 tests via Django's test runner.
@@ -282,7 +284,9 @@ Methods
 
 .. method:: DjangoTestSuiteRunner.setup_test_environment(**kwargs)
 
-    Sets up the test environment ready for testing.
+    Sets up the test environment by calling
+    :func:`~django.test.utils.setup_test_environment` and setting
+    :setting:`DEBUG` to ``False``.
 
 .. method:: DjangoTestSuiteRunner.build_suite(test_labels, extra_tests=None, **kwargs)