feedback: fix docstring
feedback: fix docstring

pfnet/chainer,wkentaro/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,wkentaro/chainer,keisuke-umezawa/chainer,t-abe/chainer,hvy/chainer,niboshi/chainer,t-abe/chainer,aonotas/chainer,truongdq/chainer,kashif/chainer,niboshi/chainer,cupy/cupy,niboshi/chainer,truongdq/chainer,kiyukuta/chainer,hvy/chainer,anaruse/chainer,muupan/chainer,sinhrks/chainer,okuta/chainer,wkentaro/chainer,cupy/cupy,jnishi/chainer,rezoo/chainer,wkentaro/chainer,ktnyt/chainer,ktnyt/chainer,keisuke-umezawa/chainer,jnishi/chainer,jnishi/chainer,AlpacaDB/chainer,cupy/cupy,tkerola/chainer,delta2323/chainer,muupan/chainer,chainer/chainer,niboshi/chainer,benob/chainer,sinhrks/chainer,chainer/chainer,okuta/chainer,hvy/chainer,chainer/chainer,cemoody/chainer,ktnyt/chainer,kikusu/chainer,ysekky/chainer,okuta/chainer,kikusu/chainer,okuta/chainer,ronekko/chainer,cupy/cupy,chainer/chainer,AlpacaDB/chainer,benob/chainer,hvy/chainer,ktnyt/chainer,jnishi/chainer