Fix style of docstring of Crop function
Fix style of docstring of Crop function

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