[Web] fixed helper text in DNS modal

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/web/templates/modals/mailbox.twig

@@ -810,7 +810,7 @@
       <div class="modal-body">
         <p>{{ lang.diagnostics.dns_records_24hours }}</p>
         <div class="dns-modal-body"></div>
-        <p>{{ lang.diagnostics.dns_records_docs }}</p>
+        <p>{{ lang.diagnostics.dns_records_docs|raw }}</p>
       </div>
     </div>
   </div>