content: fix 7years typo
content: fix 7years typo

Change-Id: Ie5f89b8763f473d38e9dc83e0793a9e161aa546d
Reviewed-on: https://go-review.googlesource.com/33023
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

jeffreyliguori/blog