auth comments

Author: rwifeng

src/Qiniu/Auth.php

@@ -85,6 +85,10 @@ public function uploadToken(
         return $this->tokenWithData($b);
     }
 
+    /**
+     *上传策略，参数规格详见
+     *http://developer.qiniu.com/docs/v6/api/reference/security/put-policy.html
+     */
     private static $policyFields = array(
         'callbackUrl',
         'callbackBody',