fix docs error
fix docs error

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