##### 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.shell)
        if not self.create_home:
            cmd.append('-H')
        if self.skeleton is not None:
            cmd.append('-k')
            cmd.append(self.skeleton)
        if self.system:
            cmd.append('-S')
        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)
        if self.password is not None:
            cmd = [self.module.get_bin_path('chpasswd', True)]
            cmd.append('--encrypted')
            data = '{name}:{password}'.format(name=self.name, password=self.password)
            rc, out, err = self.execute_command(cmd, data=data)
            if rc is not None and rc != 0:
                self.module.fail_json(name=self.name, msg=err, rc=rc)
        
        if self.groups is not None and len(self.groups):
            groups = self.get_groups_set()
            add_cmd_bin = self.module.get_bin_path('adduser', True)
            for group in groups:
                cmd = [add_cmd_bin, self.name, group]
                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)
        return rc, out, err
    def remove_user(self):