Fix installation examples
Fix installation examples

okuta/chainer,hvy/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,wkentaro/chainer,niboshi/chainer,okuta/chainer,chainer/chainer,niboshi/chainer,wkentaro/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,okuta/chainer,chainer/chainer,hvy/chainer,pfnet/chainer,wkentaro/chainer,wkentaro/chainer,chainer/chainer