doc: Improve Japanese lxc-wait(1)

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
doc: Improve Japanese lxc.conf(5)

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
doc: Improve Japanese lxc(7)

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>