Fix docstring
Fix docstring

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