removed incorrect docs on data_file.

Author: abrisco

docs/config.rst

@@ -23,8 +23,8 @@ For full details refer to the `coverage config file`_ documentation.
 
 .. note:: Important Note
 
-    This plugin overrides the ``data_file`` and ``parallel`` options of coverage. Unless you also run coverage without
-    pytest-cov it's pointless to set those options in your ``.coveragerc``.
+    This plugin overrides the ``parallel`` option of coverage. Unless you also run coverage without pytest-cov it's
+    pointless to set those options in your ``.coveragerc``.
 
     If you use the ``--cov=something`` option (with a value) then coverage's ``source`` option will also get overridden.
     If you have multiple sources it might be easier to set those in ``.coveragerc`` and always use ``--cov`` (without a value)