[U-Boot] doc: clarify openssl-based key and certificate generation process

[Tom Rini]

On Wed, Mar 23, 2016 at 06:24:10PM -0500, Andreas Dannenberg wrote:

> Add some basic clarification that the dev.key file generated by OpenSSL
> contains both the public and private key, and further highlight that
> the certificate generated here contains the public key only.
> 
> Signed-off-by: Andreas Dannenberg <dannenberg at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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