Fix docstring of StatefulPeepholeLSTM.
Fix docstring of StatefulPeepholeLSTM.

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