PROMOD-1:Short info about unit test make targets

doc/contributing.rst

@@ -199,7 +199,8 @@ only running unit tests from all modules in |project|. Actually ``make check``
 does nothing more but invoking ``doctest``, ``linkcheck`` and ``codetest`` as
 dependencies. You could even go with running tests gathered in a single file:
 assuming you have :file:`your_module/tests/test_awesome_feature.py`, |cmake|
-will provide you with a target ``test_awesome_feature.py_run``.
+will provide you with a target ``test_awesome_feature.py_run``. If your module
+has |C++| tests, those will be available by ``test_suite_your_module_run``.
 
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