[Doc] Minor fixup in launching_test.rst

Author: Lucas-C

doc/development_guide/contributor_guide/tests/launching_test.rst

@@ -7,7 +7,7 @@ pytest
 Since we use pytest_ to run the tests, you can also use it on its own.
 We do recommend using the tox_ command though::
 
-    pytest pylint -k test_functional
+    pytest tests/ -k test_functional
 
 You can use pytest_ directly. If you want to run tests on a specific portion of the
 code with pytest_ and your local python version::