fix wording
fix wording

Co-Authored-By: sonots <dac77b53c41f6b3473495759223324a3500b725e@gmail.com>
okuta/chainer,chainer/chainer,wkentaro/chainer,jnishi/chainer,niboshi/chainer,chainer/chainer,okuta/chainer,keisuke-umezawa/chainer,hvy/chainer,tkerola/chainer,keisuke-umezawa/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,pfnet/chainer,ktnyt/chainer,ktnyt/chainer,chainer/chainer,ktnyt/chainer,wkentaro/chainer,hvy/chainer,jnishi/chainer,niboshi/chainer,keisuke-umezawa/chainer,niboshi/chainer,hvy/chainer,ktnyt/chainer,wkentaro/chainer,okuta/chainer