hulk inclusion
category: feature
bugzilla: 12800
CVE: NA

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Now we support crashkernel=X,[high,low] on arm64, update the
Documentation.
Signed-off-by: NChen Zhou <chenzhou10@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>