Doc: starpu_opencl_get_device and starpu_opencl_get_queue

doc/chapters/basic-api.texi

@@ -1830,11 +1830,11 @@ todo
 @end deftypefun
 
 @deftypefun void starpu_opencl_get_device (int @var{devid}, {cl_device_id *}@var{device})
-todo
+Places the cl_device_id corresponding to @var{devid} in @var{device}.
 @end deftypefun
 
 @deftypefun void starpu_opencl_get_queue (int @var{devid}, {cl_command_queue *}@var{queue});
-todo
+Places the command queue of the the device designated by @var{devid} into @var{queue}.
 @end deftypefun
 
 @deftypefun void starpu_opencl_get_current_context ({cl_context *}@var{context})