[U-Boot] doc: Tidy up first part of top-level README file

[Tom Rini]

On Sat, Dec 19, 2015 at 07:16:10AM -0500, Robert P. J. Day wrote:

> First (small) pass at tidying up the README file, including:
> 
>  * remove references to obsolete CREDITS file
>  * remove (some) references to obsolete boards.cfg file
>  * remove at least one reference to a "scrapped" board
>  * cut down unnecessarily detailed directory hierarchy
>  * bunch of grammar and spelling tweaks
> 
> Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

Applied to u-boot/master, thanks!

-- 
Tom
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