[U-Boot] doc: README: Correct file name of signature verification documentation

[Tom Rini]

On Mon, Jan 20, 2014 at 04:21:46PM +0100, Detlev Zundel wrote:

> Signed-off-by: Detlev Zundel <dzu at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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