I wonder if there is a intended place to show the doctype description. I see that ERPNext shows them occationally under the entry form (e.g. Product Bundle).
A similiar question is related to the modules description. A (new) record in desc.py could show them in the default menues.
That would cover most of the basic help that should be provided to users. A (context aware) placement within the help at the top could also make sense.