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.
data_elements = data.get('elements', None)
            if (doc_elements or data_elements) and not (doc_elements == data_elements):
                msg = "Argument '%s' in argument_spec" % arg
                if context:
                    msg += " found in %s" % " -> ".join(context)
                if data_elements:
                    msg += " specifies elements as %s," % data_elements
                else:
                    msg += " does not specify elements,"
                if doc_elements:
                    msg += "but elements is documented as being %s" % doc_elements
                else:
                    msg += "but elements is not documented"
                self.reporter.error(
                    path=self.object_path,
                    code='doc-elements-mismatch',
                    msg=msg
                )
            spec_suboptions = data.get('options')
            doc_suboptions = doc_options_arg.get('suboptions', {})
            if spec_suboptions:
                if not doc_suboptions:
                    msg = "Argument '%s' in argument_spec" % arg
                    if context:
                        msg += " found in %s" % " -> ".join(context)
                    msg += " has sub-options but documentation does not define it"
                    self.reporter.error(
                        path=self.object_path,
                        code='missing-suboption-docs',
                        msg=msg