[release-branch.go1.6] doc/go1.7.html: remove DRAFT
[release-branch.go1.6] doc/go1.7.html: remove DRAFT

Fixes #15820.

Change-Id: Ia5d5237754e77774a3a6049765eea163911f41c9
Reviewed-on: https://go-review.googlesource.com/25592
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-on: https://go-review.googlesource.com/27054
Reviewed-by: Chris Broadfoot <0c2851a4f8ab4aa5606e69c0757771dd13dbe686@golang.org>

4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go