Fix docstring of CTC
Fix docstring of CTC

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