Extend / specify file comment on MDInvalidNodaLink

exceptions/updates/MDInvalidNodaLink.php

@@ -1,6 +1,7 @@
 <?PHP
 /**
  * This file contains an exception class for usage of invalid noda links.
+ * As a direct decendent of Exception, triggering this exception will lead to a report.
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
@@ -10,7 +11,7 @@ declare(strict_types = 1);
  * Custom exception class to be raised when trying to use a language that is not
  * accepted by museum-digital.
  */
-final class MDInvalidNodaLink extends Exception {
+class MDInvalidNodaLink extends Exception {
     /**
      * Error message.
      *