zh_CN: Add translations for admin-guide/mm/ksm.rst

Translate Documentation/admin-guide/mm/ksm.rst into Chinese.

Reviewed-by: Yang Yang <yang.yang29@zte.com.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/f987a3a2cbffaad64f6e2377a5e393d9afbb099c.1646899056.git.siyanteng@loongson.cn


Signed-off-by: Jonathan Corbet <corbet@lwn.net>