doc: update overlayfs and aufs in Japanese lxc.container.conf(5)
doc: update overlayfs and aufs in Japanese lxc.container.conf(5)

add the description of multiple lower layer.
Update for commit 280d237

Signed-off-by: Sungbae Yoo <9c91d5afa0c90d20e6ad0b8c4cba3a84f4dfe7ec@samsung.com>

ss1h2a3tw/lxc,thmo/lxc,tych0/lxc,terceiro/lxc,cjwatson/lxc,QingweiPeterLan/cs188-lxc,QingweiPeterLan/cs188-lxc,bostjan/lxc,aeris/lxc,aeris/lxc,akshaykarle/lxc,hallyn/lxc,hallyn/lxc,caglar10ur/lxc,thmo/lxc,federicobriata/lxc,LynxChaus/lxc,akshaykarle/lxc,GreatFruitOmsk/lxc,GreatFruitOmsk/lxc,LynxChaus/lxc,bostjan/lxc,ysbnim/lxc,hfuCN/lxc,ss1h2a3tw/lxc,federicobriata/lxc,thmo/lxc,hfuCN/lxc,cjwatson/lxc,ss1h2a3tw/lxc,QingweiPeterLan/cs188-lxc,tych0/lxc,akshaykarle/lxc,aeris/lxc,LynxChaus/lxc,hfuCN/lxc,federicobriata/lxc,cjwatson/lxc,hallyn/lxc,GreatFruitOmsk/lxc,tych0/lxc,caglar10ur/lxc,terceiro/lxc,bostjan/lxc,ysbnim/lxc,terceiro/lxc,caglar10ur/lxc,ysbnim/lxc