[U-Boot] doc: cmd: bubt: drop duplicated text

[Tom Rini]

On Sun, Jun 03, 2018 at 04:19:31PM +0300, Baruch Siach wrote:

> This commit removes text that is exact duplicated of the text above.
> 
> Cc: Konstantin Porotchkin <kostap at marvell.com>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> Reviewed-by: Stefan Roese <sr at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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