DOC: fix typo in comments

Hi Willy,

There is a patch to fix typo in comments, please check the attachment
for you information.

The commit log is as below:

commit 9824d1b3740ac2746894f1aa611c795366c84210
Author: Godbach <nylzhaowei@gmail.com>
Date:   Mon Sep 30 11:05:42 2013 +0800

    DOC: fix typo in comments

      0x20000000 -> 0x40000000
      vuf -> buf
      ethod -> Method

    Signed-off-by: Godbach <nylzhaowei@gmail.com>

--
Best Regards,
Godbach

From 9824d1b3740ac2746894f1aa611c795366c84210 Mon Sep 17 00:00:00 2001
From: Godbach <nylzhaowei@gmail.com>
Date: Mon, 30 Sep 2013 11:05:42 +0800
Subject: [PATCH] DOC: fix typo in comments

  0x20000000 -> 0x40000000
  vuf -> buf
  ethod -> Method

Signed-off-by: Godbach <nylzhaowei@gmail.com>