##### 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.authorization)
        if self.role is not None and info[9] != self.role:
            cmd.append('-R')
            cmd.append(self.role)
        
        if cmd_len != len(cmd):
            cmd.append(self.name)
            (rc, out, err) = self.execute_command(cmd)
            if rc is not None and rc != 0:
                self.module.fail_json(name=self.name, msg=err, rc=rc)
        else:
            (rc, out, err) = (None, '', '')
        
        if self.update_password == 'always' and self.password is not None and info[1] != self.password:
            self.backup_shadow()
            (rc, out, err) = (0, '', '')
            if not self.module.check_mode:
                minweeks, maxweeks, warnweeks = self.get_password_defaults()
                try:
                    lines = []
                    with open(self.SHADOWFILE, 'rb') as f:
                        for line in f:
                            line = to_native(line, errors='surrogate_or_strict')
                            fields = line.strip().split(':')
                            if not fields[0] == self.name:
                                lines.append(line)
                                continue
                            fields[1] = self.password
                            fields[2] = str(int(time.time() // 86400))
                            if minweeks: