🦋 The code style has been fixed

Author: andrey-helldar

docs/snippets/advanced-directive-mixed.php

@@ -16,7 +16,7 @@ public function toArray(): array
             'foo' => 'bar',
 
             'some' => [
-                '@mixed' => <<<XML
+                '@mixed' => <<<'XML'
                     <first>value</first>
                     <second>value</second>
                     XML,