Fix docstring
Fix docstring

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