function fb_devel_cb_help in Drupal for Facebook 7.4
Drupal menu callback.
Let administrators know when their app is configured with old-style path prefix.
1 string reference to 'fb_devel_cb_help'
File
- ./fb_devel.module, line 307 
- Makes development with Drupal for Facebook much easier. Keep this module enabled until you're confident your app works perfectly.
Code
function fb_devel_cb_help() {
  //@todo more verbose message with instructions.
  $output[] = array(
    '#markup' => t('Your Facbook canvas page (or page tab) is configured for the previous version of <em>Drupal for Facebook (modules/fb)</em>.'),
  );
  return $output;
}