go.blog: fix link in normalization article
go.blog: fix link in normalization article

R=golang-dev, iant
https://codereview.appspot.com/34410044

webfd/go-zh.blog,bryanxu/go-zh.blog,d0f/go-zh.blog,webfd/go-zh.blog,d0f/go-zh.blog,bryanxu/go-zh.blog