forked from Mirrors/opensbi

We fix few typos in documentation. Signed-off-by: zhangdongdong <zhangdongdong@eswincomputing.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>