[U-Boot] [U-Boot, v2] doc: fix documentation of out-of-tree build

[Tom Rini]

On Thu, Nov 06, 2014 at 02:39:05PM +0200, Timo Ketola wrote:

> Correct environment variable for output directory is KBUILD_OUTPUT.
> 
> Signed-off-by: Timo Ketola <timo at exertus.fi>

Applied to u-boot/master, thanks!

-- 
Tom
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