[x/tour] tour: add missing n in significance
[x/tour] tour: add missing n in significance

Fixes bug 10694

Change-Id: Iaf0c8d5d93656cfd8e4ad9762ee4e1cce0bf8496
Reviewed-on: https://go-review.googlesource.com/9639
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
X-Tour-Commit: a62fd1ebf0766eef6f4388a39895107775404bbd

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