[U-Boot] common/cmd_io.c: Fix incorrect help for iod/iow

[Tom Rini]

On Mon, Oct 20, 2014 at 04:14:53PM +0800, Bin Meng wrote:

> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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