Fix cublas_device cmake comment
Fix cublas_device cmake comment

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