[5.3] Fix copy / paste error in form fields

libraries/src/Form/Field/AuthorField.php

@@ -29,7 +29,7 @@ class AuthorField extends ListField
     public $type = 'Author';
 
     /**
-     * Cached array of the category items.
+     * Cached array of the user items.
      *
      * @var    array[]
      * @since  3.2

libraries/src/Form/Field/LimitboxField.php

@@ -31,7 +31,7 @@ class LimitboxField extends ListField
     public $type = 'Limitbox';
 
     /**
-     * Cached array of the category items.
+     * Cached array of the list limits.
      *
      * @var    array[]
      * @since  3.2

libraries/src/Form/Field/PredefinedlistField.php

@@ -31,7 +31,7 @@ abstract class PredefinedlistField extends ListField
     protected $type = 'Predefinedlist';
 
     /**
-     * Cached array of the category items.
+     * Cached array of the predefined items.
      *
      * @var    array[]
      * @since  3.2

libraries/src/Form/Field/UsergrouplistField.php

@@ -32,7 +32,7 @@ class UsergrouplistField extends ListField
     protected $type = 'UserGroupList';
 
     /**
-     * Cached array of the category items.
+     * Cached array of the user groups.
      *
      * @var    array[]
      * @since  3.2