content: remove line that doesn't add and is confusing
content: remove line that doesn't add and is confusing

Fixes golang/go#18926.

Change-Id: I03d5f7adcd2db0e862cffb5ff035d804b0d3b1db
Reviewed-on: https://go-review.googlesource.com/36220
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

Go-zh/tour,dupoxy/go-tour-fr,zorion/go-tour-ca,Go-zh/tour,Go-zh/tour,golians/tour,shuLhan/go-tour-id,golians/tour,dupoxy/go-tour-fr,shuLhan/tour,golang/tour,shuLhan/go-tour-id,shuLhan/go-tour-id,Go-zh/tour,dupoxy/go-tour-fr,zorion/go-tour-ca,shuLhan/tour,shuLhan/tour,golians/tour