[x/blog] go.blog: fix links in Go 1.2 release article
[x/blog] go.blog: fix links in Go 1.2 release article

R=dsymonds
https://golang.org/cl/35740043
X-Blog-Commit: af8f72b8d398cc3474a96398c58e7ae6a9401625

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website