fix indentation in docs
fix indentation in docs

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