fix docstrings
fix docstrings

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