Update featured test command
The old one didn't work and wasn't really targetting a specific test.
The new one shows how to exactly call one single test.
Syntax explained here:
@@ -195,7 +195,7 @@ To run specific tests, you can specify the test name too, something like:
.. code-block:: bash
- $ nosetests conans.test.integration.flat_requirements_test --nocapture
+ $ nosetests conans.test.command.config_install_test:ConfigInstallTest.install_file_test --nocapture
The ``--nocapture`` argument can be useful to see some output that otherwise is captured by nosetests.
