[x/tour] content: say that a a pointer points to a 'value', not 'variable'
[x/tour] content: say that a a pointer points to a 'value', not 'variable'

Fixes golang/go#16482

Change-Id: I8f30f817808eb65db3fa77ec810af978bf92ae24
Reviewed-on: https://go-review.googlesource.com/25163
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
X-Tour-Commit: c9941e54e5b8e9618a8c951bc89798f85f6a7a71

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