update docs
update docs

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