Merge branch 'cs/zendframework/zendframework#6964-zend-http-request-g…

…etcookie-docblock-fixes'

Close zendframework/zendframework#6964

src/Request.php

@@ -279,7 +279,7 @@ public function getPost($name = null, $default = null)
      * Return the Cookie header, this is the same as calling $request->getHeaders()->get('Cookie');
      *
      * @convenience $request->getHeaders()->get('Cookie');
-     * @return Header\Cookie
+     * @return Header\Cookie|bool
      */
     public function getCookie()
     {