Document auth_membership as being Solaris specific

Hi,

When managing a user on a Windows 2016 I've used a resource like so:

 define profiles::windows::account(

  $account_name = $title,

  $password,

  $is_admin,

){

  if ($is_admin == true){

    $groups = ['Users','Administrators']

  }

  else {

    $groups = ['Users','Remote Desktop Users']

  }

  user { "${title}":

    ensure          => present,

    name            => $title,

    password        => Sensitive($password),

    managehome      => true,

    groups          => $groups,

    auth_membership => 'inclusive',

  }

} 

However when I create a user with this and then switch is_admin to false puppet adds the remote desktop group but doesn't remove the administrators group.

Notice: /Stage[main]/Profiles::Windows::Accounts/Profiles::Windows::Account[test_user]/User[test_user]/groups: groups changed BUILTIN\Administrators,BUILTIN\Users to ['BUILTIN\Administrators', 'BUILTIN\Users', 'BUILTIN\Remote Desktop Users']

From the docs the inclusive auth_membership should remove the user from the group?

Puppet agent version: 5.5.6

Puppet server version: 5.3.1 running on CentOs 7.