explicit example of use of specific_nodes

doc/doxygen/chapters/310_data_management.doxy

@@ -1,7 +1,7 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
  * Copyright (C) 2010-2017                                CNRS
- * Copyright (C) 2009-2011,2014-2017                      Université de Bordeaux
+ * Copyright (C) 2009-2011,2014-2018                      Université de Bordeaux
  * Copyright (C) 2011-2012                                Inria
  *
  * StarPU is free software; you can redistribute it and/or modify
@@ -871,6 +871,7 @@ struct starpu_codelet cl =
 \endcode
 
 the first data of the task will be kept in the main memory, while the second
-data will be copied to the CUDA GPU as usual.
+data will be copied to the CUDA GPU as usual. A working example is available in
+<c>tests/datawizard/specific_node.c</c>
 
 */