RDFLib has a docstring for rdflib.NORMALIZE_LITERALS, and we use autodoc which generates the following for the rdflib module:

Module contents
---------------

.. automodule:: rdflib
   :members:
   :undoc-members:
   :show-inheritance:

As far as I understand, the presence of :members: should result in some documentation for rdflib.NORMALIZE_LITERALS. However, there is no documentation being generated for it as far as I can tell. If it were generated, I would expect to see it here.