Fix docstring of ctc
Fix docstring of ctc

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