Update PHPDoc of addFilter and addFilterToCollection

Author: Diego Sinclair

src/app/Library/CrudPanel/Traits/Filters.php

@@ -45,7 +45,7 @@ public function clearFilters()
      * Add a filter to the CRUD table view.
      *
      * @param  array  $options  Name, type, label, etc.
-     * @param  bool|array|\Closure  $values  The HTML for the filter.
+     * @param  bool|string|array|\Closure  $values  The HTML for the filter.
      * @param  bool|\Closure  $filterLogic  Query modification (filtering) logic when filter is active.
      * @param  bool|\Closure  $fallbackLogic  Query modification (filtering) logic when filter is not active.
      */
@@ -62,7 +62,7 @@ public function addFilter($options, $values = false, $filterLogic = false, $fall
      * The filter will NOT get applied.
      *
      * @param  array  $options  Name, type, label, etc.
-     * @param  bool|array|\Closure  $values  The HTML for the filter.
+     * @param  bool|string|array|\Closure  $values  The HTML for the filter.
      * @param  bool|\Closure  $filterLogic  Query modification (filtering) logic when filter is active.
      * @param  bool|\Closure  $fallbackLogic  Query modification (filtering) logic when filter is not active.
      */