Function remove_undocumented

Removes symbols in a module that are not referenced by a docstring. Args: module_name: the name of the module (usually `__name__`). allowed_exception_list: a list of names that should not be removed. doc_string_modules: a list of modules from which to take the docstrings. If None,

(module_name, allowed_exception_list=None,
                        doc_string_modules=None)