add esc to echo $error

Author: sba

user_guide_src/source/libraries/validation/030.php

@@ -1,7 +1,7 @@
 <?php if (! empty($errors)): ?>
     <div class="alert alert-danger">
     <?php foreach ($errors as $field => $error): ?>
-        <p><?= $error ?></p>
+        <p><?= esc($error) ?></p>
     <?php endforeach ?>
     </div>
 <?php endif ?>