Merge pull request #2192 from pick7/codex/document-protected-traversal

Render protected Traversable methods in the reference

Author: Byron

doc/source/reference.rst

@@ -91,6 +91,7 @@ Objects.Util
 .. automodule:: git.objects.util
    :members:
    :undoc-members:
+   :private-members: _get_intermediate_items, _list_traverse, _traverse
    :special-members:
 
 Index.Base