Clarify opencljit.make_python_function docstring

pystencils/opencl/opencljit.py

@@ -9,8 +9,8 @@ USE_FAST_MATH = True
 
 def make_python_function(kernel_function_node, opencl_queue, opencl_ctx, argument_dict=None, custom_backend=None):
     """
-    Creates a kernel function from an abstract syntax tree which
-    was created e.g. by :func:`pystencils.gpucuda.create_cuda_kernel`
+    Creates a **OpenCL** kernel function from an abstract syntax tree which
+    was created for the ``target='gpu'`` e.g. by :func:`pystencils.gpucuda.create_cuda_kernel`
     or :func:`pystencils.gpucuda.created_indexed_cuda_kernel`
 
     Args: