fix docblock

gotta love duplication

Author: ptarjan

S3.php

@@ -2303,8 +2303,8 @@ private function __dnsBucketName($bucket)
 	/**
 	* CURL header callback
 	*
-	* @param resource &$curl CURL resource
-	* @param string &$data Data
+	* @param resource $curl CURL resource
+	* @param string $data Data
 	* @return integer
 	*/
 	private function __responseHeaderCallback($curl, $data)