https://github.com/ansible/ansible/blob/1706d35fc476e36fcced25435c2f1c2401536376/test/lib/ansible_test/_util/controller/sanity/validate-modules/validate_modules/main.py#L414

When a module is in place to provide documentation for an action, it should be allowed to have a doc string.

Without a docstring users of pydocstring will need to suppress:

```
************* Module plugins.modules.git_away
plugins/modules/git_away.py:1:0: C0114: Missing module docstring (missing-module-docstring)
************* Module plugins.modules.git_here
plugins/modules/git_here.py:1:0: C0114: Missing module docstring (missing-module-docstring)
```

With a doc string the module is treated as a "real" module and fails sanity:

```
ansible-module-not-initialized: Execution of the module did not result in initialization of AnsibleModule
```

PEP257 suggests modules should have a docstring, and is generally considered a good practice to inform future developers of the purpose of the file and can be used for documentation generation as well.
self.name, 'DOCUMENTATION'
                )
                if doc:
                    add_collection_to_versions_and_dates(doc, self.collection_name,
                                                         is_module=self.plugin_type == 'module')
                for error in errors:
                    self.reporter.error(
                        path=self.object_path,
                        code='documentation-syntax-error',
                        **error
                    )
                for trace in traces:
                    self.reporter.trace(
                        path=self.object_path,
                        tracebk=trace
                    )
                if not errors and not traces:
                    missing_fragment = False
                    with CaptureStd():
                        try:
                            get_docstring(self.path, fragment_loader, verbose=True,
                                          collection_name=self.collection_name,
                                          is_module=self.plugin_type == 'module')
                        except AssertionError:
                            fragment = doc['extends_documentation_fragment']
                            self.reporter.error(
                                path=self.object_path,
                                code='missing-doc-fragment',
                                msg='DOCUMENTATION fragment missing: %s' % fragment
                            )