doc/go1.11: remove unnecessary absolute link

This doesn't auto-deploy to golang.org, only tip.golang.org.

Change-Id: I112743ada2c1393e21edcc9075127f40da9e6270
Reviewed-on: https://go-review.googlesource.com/124755Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.11.html

@@ -136,8 +136,7 @@ Do not send CLs removing the interior tags from such phrases.
     NOTE: This is not present in go1.11beta1 but will be available in future
     betas and subsequent releases.
   </strong>
-  <!-- TODO s;https://tip.golang.org;; for final release (right now golang.org/cmd/go doesn't have that section) -->
-  Go 1.11 adds preliminary support for a <a href="https://tip.golang.org/cmd/go/#hdr-Modules__module_versions__and_more">new concept called “modules,”</a>
+  Go 1.11 adds preliminary support for a <a href="/cmd/go/#hdr-Modules__module_versions__and_more">new concept called “modules,”</a>
   an alternative to GOPATH with integrated support for versioning and
   package distribution.
   Using modules, developers are no longer confined to working inside GOPATH,