The library library(pldoc/doc_library) defines doc_load_library/0 
to load the entire library.
:- doc_server(4000,
              [ allow('.my.org')
              ]).
:- use_module(library(pldoc/doc_library)).
:- doc_load_library.
Example code can be found in $PLBASE/doc/packages/examples/pldoc.