[U-Boot] README.kconfig: fix typo

[Tom Rini]

On Tue, Oct 21, 2014 at 01:27:45PM +0300, Igor Grinberg wrote:

> Fix typo in defconfig file format description.
> 
> Signed-off-by: Igor Grinberg <grinberg at compulab.co.il>
> Cc: Masahiro Yamada <yamada.m at jp.panasonic.com>
> Acked-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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