Revise the expression of from_chainerx docs based on review
Revise the expression of from_chainerx docs based on review

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