##### 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.module.get_bin_path('userdel', True)]
        if self.remove:
            cmd.append('-r')
        cmd.append(self.name)
        return self.execute_command(cmd)
    def create_user_useradd(self, command_name='useradd'):
        cmd = [self.module.get_bin_path(command_name, True)]
        if self.uid is not None:
            cmd.append('-u')
            cmd.append(self.uid)
        if self.group is not None:
            if not self.group_exists(self.group):
                self.module.fail_json(msg="Group %s does not exist" % self.group)
            cmd.append('-g')
            cmd.append(self.group)
        if self.groups is not None and len(self.groups):
            groups = self.get_groups_set()
            cmd.append('-G')
            cmd.append(','.join(groups))
        if self.comment is not None:
            cmd.append('-c')
            cmd.append(self.comment)
        if self.home is not None:
            cmd.append('-d')