[x/blog] x/blog: fix idiotic spelling mistake
[x/blog] x/blog: fix idiotic spelling mistake

TBR=r
R=r
CC=golang-codereviews
https://golang.org/cl/172240043
X-Blog-Commit: 31e361617e1341da9869adcc490624fe59138f85

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