Fixed #21625 -- incorrect documentation for DiscoverRunner.build_suite

    Run the test suite.

    ``test_labels`` is a list of strings describing the tests to be run. A test

    label can take one of four forms:

    * ``path.to.test_module.TestCase.test_method`` -- Run a single test method

      in a test case.

    * ``path.to.test_module.TestCase`` -- Run all the test methods in a test

      case.

    * ``path.to.module`` -- Search for and run all tests in the named Python

      package or module.

    * ``path/to/directory`` -- Search for and run all tests below the named

      directory.

    If ``test_labels`` has a value of ``None``, the test runner will search for

    tests in all files below the current directory whose names match its

    ``pattern`` (see above).

    ``test_labels`` allows you to specify which tests to run and supports

    several formats (see :meth:`DiscoverRunner.build_suite` for a list of

    supported formats).

    ``extra_tests`` is a list of extra ``TestCase`` instances to add to the

    suite that is executed by the test runner. These extra tests are run

    Constructs a test suite that matches the test labels provided.

    ``test_labels`` is a list of strings describing the tests to be run. A test

    label can take one of three forms:

    label can take one of four forms:

    * ``app.TestCase.test_method`` -- Run a single test method in a test

    * ``path.to.test_module.TestCase.test_method`` -- Run a single test method

      in a test case.

    * ``path.to.test_module.TestCase`` -- Run all the test methods in a test

      case.

    * ``app.TestCase`` -- Run all the test methods in a test case.

    * ``app`` -- Search for and run all tests in the named application.

    * ``path.to.module`` -- Search for and run all tests in the named Python

      package or module.

    * ``path/to/directory`` -- Search for and run all tests below the named

      directory.

    If ``test_labels`` has a value of ``None``, the test runner should run

    search for tests in all the applications in :setting:`INSTALLED_APPS`.

    If ``test_labels`` has a value of ``None``, the test runner will search for

    tests in all files below the current directory whose names match its

    ``pattern`` (see above).

    ``extra_tests`` is a list of extra ``TestCase`` instances to add to the

    suite that is executed by the test runner. These extra tests are run