[4.x] Typo (#58)

reference

Author: brianteeman

src/StringHelper.php

@@ -261,7 +261,7 @@ public static function strlen($str)
      * @param   string|string[]       $search   String to search
      * @param   string|string[]       $replace  Existing string to replace
      * @param   string                $str      New string to replace with
-     * @param   integer|null|boolean  $count    Optional count value to be passed by referene
+     * @param   integer|null|boolean  $count    Optional count value to be passed by reference
      *
      * @return  string  UTF-8 String
      *