Fixed docblock

(cherry picked from commit a4d723e14cf4cacfcf7021fd504586304bf5ffe8)

tests/Zend/Db/TestSetup.php

@@ -42,7 +42,7 @@ require_once 'Zend/Db.php';
 abstract class Zend_Db_TestSetup extends PHPUnit_Framework_TestCase
 {
     /**
-     * @var Zend_Db_TestUtil
+     * @var Zend_Db_TestUtil_Common
      */
     protected $_util = null;