Fix links in document
Fix links in document

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