content: fix spelling
content: fix spelling

Change-Id: Ia93eb978c76fbbe082b46d07b5cb954e8d3c57a8
Reviewed-on: https://go-review.googlesource.com/22009
Reviewed-by: Nigel Tao <58ae08b3356928ff9c67562b4719487d54fe8348@golang.org>

jeffreyliguori/blog