##### 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.append(self.ssh_bits)
        cmd.append('-C')
        cmd.append(self.ssh_comment)
        cmd.append('-f')
        cmd.append(ssh_key_file)
        if self.ssh_passphrase is not None:
            if self.module.check_mode:
                self.module.debug('In check mode, would have run: "%s"' % cmd)
                return (0, '', '')
            master_in_fd, slave_in_fd = pty.openpty()
            master_out_fd, slave_out_fd = pty.openpty()
            master_err_fd, slave_err_fd = pty.openpty()
            env = os.environ.copy()
            env['LC_ALL'] = 'C'
            try:
                p = subprocess.Popen([to_bytes(c) for c in cmd],
                                     stdin=slave_in_fd,
                                     stdout=slave_out_fd,
                                     stderr=slave_err_fd,
                                     preexec_fn=os.setsid,
                                     env=env)
                out_buffer = b''
                err_buffer = b''
                while p.poll() is None:
                    r, w, e = select.select([master_out_fd, master_err_fd], [], [], 1)
                    first_prompt = b'Enter passphrase (empty for no passphrase):'
                    second_prompt = b'Enter same passphrase again'
                    prompt = first_prompt
                    for fd in r:
                        if fd == master_out_fd: