Update settings.php.dist

Author: JanSlabon

examples/settings.php.dist

@@ -3,6 +3,7 @@
 return [
     'clientId' => 'your-client-id',
     'clientSecret' => 'your-client-secret',
+//    'accountId' => 'your-account-id-which-is-used-to-create-an-account_token', // optional
     'demoUrl' => 'https://your-domain/path-to-this-directory/',
     'oauth2scope' => 'service',
     'apiUri' => 'https://cs-try.ssl.com/csc/v0'