[1.7.x] Fixed #23744 -- Fixed typo in selenium testing example.

.. code-block:: bash

    ./manage.py test myapp.MySeleniumTests.test_login

    ./manage.py test myapp.tests.MySeleniumTests.test_login

This example will automatically open Firefox then go to the login page, enter

the credentials and press the "Log in" button. Selenium offers other drivers in