Improved PHPDoc for Zend_Cloud

Closes #640

library/Zend/Cloud/AbstractFactory.php

@@ -30,8 +30,6 @@ class Zend_Cloud_AbstractFactory
 {
     /**
      * Constructor
-     *
-     * @return void
      */
     private function __construct()
     {

library/Zend/Cloud/QueueService/Factory.php

@@ -39,8 +39,6 @@ class Zend_Cloud_QueueService_Factory extends Zend_Cloud_AbstractFactory
 
     /**
      * Constructor
-     *
-     * @return void
      */
     private function __construct()
     {
@@ -51,7 +49,8 @@ class Zend_Cloud_QueueService_Factory extends Zend_Cloud_AbstractFactory
      * Retrieve QueueService adapter
      *
      * @param  array $options
-     * @return void
+     * @return null|Zend_Cloud_DocumentService_Adapter|Zend_Cloud_QueueService_Adapter|Zend_Cloud_StorageService_Adapter
+     * @throws Zend_Cloud_QueueService_Exception
      */
     public static function getAdapter($options = array())
     {