fixup: clean up phrasing.

Author: dianakhuang

docs/testing_and_debugging.rst

@@ -70,8 +70,8 @@ Custom Logging Testing
 ----------------------
 
 If you would like to test modifications to the docker logging configuration as
-listed in the custom-created `public-dockerfiles logging configuration`_, this
-file won't exist in devstack due to the local edx-platform copy overriding it.
+listed in the custom-created `public-dockerfiles logging configuration`_, the ``docker-production.py``
+won't exist in devstack due to the local edx-platform copy being mounted as a volume over it.
 
 Any changes will need to be copied over into ``/py_configuration_files/{lms,cms}.py`` to be tested
 on devstack.