Fix docstring
Fix docstring

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