Fix doc string
Fix doc string

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