##### SUMMARY
The documentation of the module *user* / parameter *shell* states:

https://github.com/ansible/ansible/blob/8edad83ae029d7838a6d6347576d2ddbcce12ad0/lib/ansible/modules/system/user.py#L79

But there are no (shell specific) notes.
##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
user / docs

##### ANSIBLE VERSION
devel branch

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### ADDITIONAL INFORMATION
Either remove the sentence or provide some information in the notes section.

cmd = self._get_dscl()
        cmd += ['-create', '/Users/%s' % self.name]
        (rc, err, out) = self.execute_command(cmd)
        if rc != 0:
            self.module.fail_json(msg='Cannot create user "%s".' % self.name, err=err, out=out, rc=rc)
        self._make_group_numerical()
        if self.uid is None:
            self.uid = str(self._get_next_uid(self.system))
        
        if self.create_home:
            if self.home is None:
                self.home = '/Users/%s' % self.name
            if not self.module.check_mode:
                if not os.path.exists(self.home):
                    os.makedirs(self.home)
                self.chown_homedir(int(self.uid), int(self.group), self.home)
        
        
        if not self.system and self.shell is None:
            self.shell = '/bin/bash'
        for field in self.fields:
            if field[0] in self.__dict__ and self.__dict__[field[0]]:
                cmd = self._get_dscl()
                cmd += ['-create', '/Users/%s' % self.name, field[1], self.__dict__[field[0]]]
                (rc, _err, _out) = self.execute_command(cmd)
                if rc != 0:
                    self.module.fail_json(msg='Cannot add property "%s" to user "%s".' % (field[0], self.name), err=err, out=out, rc=rc)
                out += _out
                err += _err
                if rc != 0: