Fix doc test errors
Fix doc test errors

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