Incorrect sample code for hook_mail_alter

See this documentation page: http://api.drupal.org/api/function/hook_mail_alter/6

The Parameters section says that $message['body'] will be an array of lines. However, in the sample code at the bottom of the page, it is treated as a string:

...
$message['body'] .= "\n\n--\nMail sent out from " . variable_get('sitename', t('Drupal'));
...

If you were to use this code, $message['body'] would normally end up containing the string "Array\n\n--\nMail send out from My Site".

The correct code should instead be something like:

...
$message['body'][] = '';
$message['body'][] = '--';
$message['body'][] = 'Mail sent out from ' . variable_get('sitename', t('Drupal'));
...