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.
else:
                doc_options_arg = doc_options[doc_options_args[0]]
                if len(doc_options_args) > 1:
                    msg = "Argument '%s' in argument_spec" % arg
                    if context:
                        msg += " found in %s" % " -> ".join(context)
                    msg += " with aliases %s is documented multiple times, namely as %s" % (
                        ", ".join([("'%s'" % alias) for alias in aliases]),
                        ", ".join([("'%s'" % alias) for alias in doc_options_args])
                    )
                    self.reporter.error(
                        path=self.object_path,
                        code='parameter-documented-multiple-times',
                        msg=msg
                    )
            try:
                doc_default = None
                if 'default' in doc_options_arg and not is_empty(doc_options_arg['default']):
                    with CaptureStd():
                        doc_default = _type_checker(doc_options_arg['default'])
            except (Exception, SystemExit):
                msg = "Argument '%s' in documentation" % arg
                if context:
                    msg += " found in %s" % " -> ".join(context)
                msg += " defines default as (%r) but this is incompatible with parameter type %r" % (doc_options_arg.get('default'), _type)
                self.reporter.error(
                    path=self.object_path,
                    code='doc-default-incompatible-type',
                    msg=msg
                )