Revealed hidden parameter in supercritical configs

- A parameter was labelled with do_not_log=.true. because it used to
  be logged elsewhere but that code has since disappeared.
- No answer changes.

src/user/supercritical_initialization.F90

@@ -39,7 +39,8 @@ subroutine supercritical_set_OBC_data(OBC, G, param_file)
         'supercritical_set_OBC_data() was called but OBC type was not initialized!')
 
   call get_param(param_file, mod, "SUPERCRITICAL_ZONAL_FLOW", zonal_flow, &
-                 default=8.57, do_not_log=.true.) ! Do not log avoids maintaining identical descriptions
+                 "Constant zonal flow imposed at upstream open boundary.", &
+                 units="m/s", default=8.57)
 
   allocate(OBC%ubt_outer(G%IsdB:G%IedB,G%jsd:G%jed)) ; OBC%ubt_outer(:,:) = 0.0