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: KATOH Yasufumi <512423cb3a4857a38f472862b51e4ab1a1730f06@jazz.email.ne.jp>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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