add overlay docs
Signed-off-by: Nshilei <shilei91@huawei.com>
Change-Id: I3605c681ef4a3565f546f2200be1101dcde5be27
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此差异已折叠。
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Signed-off-by: Nshilei <shilei91@huawei.com>
Change-Id: I3605c681ef4a3565f546f2200be1101dcde5be27