Update docstring of backend.get_device_from_array
Update docstring of backend.get_device_from_array

jnishi/chainer,keisuke-umezawa/chainer,niboshi/chainer,okuta/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,chainer/chainer,chainer/chainer,pfnet/chainer,okuta/chainer,keisuke-umezawa/chainer,chainer/chainer,okuta/chainer,ktnyt/chainer,wkentaro/chainer,wkentaro/chainer,ktnyt/chainer,jnishi/chainer,hvy/chainer,hvy/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,niboshi/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,chainer/chainer,tkerola/chainer,hvy/chainer,hvy/chainer