design: disambiguate offical spaces in CoC by linking to them

Update golang/go#13073

Change-Id: I229140cc205c55bf2028e209c3795b617852eb54
Reviewed-on: https://go-review.googlesource.com/17025
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/design/13073-code-of-conduct.md b/design/13073-code-of-conduct.md
index b1f5e02..c0a3451 100644
--- a/design/13073-code-of-conduct.md
+++ b/design/13073-code-of-conduct.md
@@ -75,11 +75,12 @@
 
 Explicit enforcement of the Code of Conduct applies to the
 official forums operated by the Go project (“Go spaces”):
-- The official Go GitHub projects,
-- Go project code reviews,
-- The #go-nuts IRC channel on Freenode,
-- The /r/golang subreddit, and
-- The golang-nuts and golang-dev mailing lists operated on Google Groups.
+- The official [GitHub projects](https://github.com/golang/)
+  and [code reviews](https://go-review.googlesource.com/).
+- The [golang-nuts](https://groups.google.com/group/golang-nuts) and
+  [golang-dev](https://groups.google.com/group/golang-dev) mailing lists.
+- The #go-nuts IRC channel on Freenode.
+- The [/r/golang subreddit](https://reddit.com/r/golang).
 
 Other Go groups (such as conferences, meetups, and other unofficial forums) are
 encouraged to adopt this Code of Conduct. Those groups must provide their own