go/...: use recommended issue tracker URLs

Change-Id: I249de6aad723f4c2c49dc028995f4f6d1fcc54fd
Reviewed-on: https://go-review.googlesource.com/c/152598
Run-TryBot: Alan Donovan <adonovan@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/go/loader/loader.go b/go/loader/loader.go
index c456661..de34b80 100644
--- a/go/loader/loader.go
+++ b/go/loader/loader.go
@@ -780,7 +780,7 @@
 	if to == "C" {
 		// This should be unreachable, but ad hoc packages are
 		// not currently subject to cgo preprocessing.
-		// See https://github.com/golang/go/issues/11627.
+		// See https://golang.org/issue/11627.
 		return nil, fmt.Errorf(`the loader doesn't cgo-process ad hoc packages like %q; see Go issue 11627`,
 			from.Pkg.Path())
 	}