docs: add @Used-By

Author: kenjis

system/Helpers/Array/ArrayHelper.php

@@ -20,6 +20,8 @@ final class ArrayHelper
      * Searches an array through dot syntax. Supports
      * wildcard searches, like foo.*.bar
      *
+     * @used-by dot_array_search()
+     *
      * @return array|bool|int|object|string|null
      */
     public static function dotSearch(string $index, array $array)
@@ -101,6 +103,8 @@ private static function arraySearchDot(array $indexes, array $array)
     /**
      * Groups all rows by their index values. Result's depth equals number of indexes
      *
+     * @used-by array_group_by()
+     *
      * @param array $array        Data array (i.e. from query result)
      * @param array $indexes      Indexes to group by. Dot syntax used. Returns $array if empty
      * @param bool  $includeEmpty If true, null and '' are also added as valid keys to group