[x/tour] content: add newline to imports.go Printf call
[x/tour] content: add newline to imports.go Printf call

Fixes golang/tour#615

Change-Id: I59401792b7aeddbdbf4baadeb822827bd19835cf
Reviewed-on: https://go-review.googlesource.com/138615
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
X-Tour-Commit: 099a0d9cc2550885869179752dfff56fc681295c

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