[x/tour] go-tour: add talk references to end of tour
[x/tour] go-tour: add talk references to end of tour

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10670043
X-Tour-Commit: ed531440416f3bee439d890c2a8773777d970351

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