Also document imported members

e.g., shapes.disc (imported from circular.disc)

docs/_config.yml

@@ -44,6 +44,7 @@ sphinx:
   config:
     #autosummary_generate: True      # autosummary generates module-level .rst files?
     add_module_names: False         # Don't include module names in autosummary tables
+    autosummary_imported_members: True
     autodoc_default_options: {
      "members": True,                # Include module/class members.
      "member-order": 'bysource',     # Order members as in source file.