Fix docstring
Fix docstring

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