Give default value of new parameter in the main example file

examples/parameter_example.yml

@@ -13,7 +13,7 @@ Scheduler:
   cell_sub_size:         64000000 # (Optional) Maximal number of interactions per sub-task  (this is the default value).
   cell_split_size:       400      # (Optional) Maximal number of particles per cell (this is the default value).
   cell_max_count:        10000    # (Optional) Maximal number of particles per cell allowed before triggering a sanitizing (this is the default value).
-  max_top_level_cells:   12       # (Optional) Maximal number of top-level cells per dimension. The number of top-level cells will be the cube of this.
+  max_top_level_cells:   12       # (Optional) Maximal number of top-level cells per dimension. The number of top-level cells will be the cube of this (this is the default value).
 
 # Parameters governing the time integration
 TimeIntegration: