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Add documentation for the sandbox bootmeth. Fix up the compatible string to drop the 'extlinux' part, which is not relevant to this bootmeth. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>