content: fix link in pkg.go.dev-2020.article

The link text for "file an issue on the Go issue tracker" was
https://golang.org/x/discovery-feedback (which is a 404).

It is fixed to be https://golang.org/s/discovery-feedback.

Fixes golang/go#36968

Change-Id: Ia46ac439544e047bd469c7814c85469d8a5395a2
Reviewed-on: https://go-review.googlesource.com/c/blog/+/217400
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/content/pkg.go.dev-2020.article b/content/pkg.go.dev-2020.article
index 5c41c4c..06e9a4b 100644
--- a/content/pkg.go.dev-2020.article
+++ b/content/pkg.go.dev-2020.article
@@ -72,7 +72,7 @@
 
 As always, our license policy is at
 [[https://pkg.go.dev/license-policy][pkg.go.dev/license-policy]]. If you are
-having issues, feel free to [[https://golang.org/x/discovery-feedback][file an issue on the Go issue tracker]], or email
+having issues, feel free to [[https://golang.org/s/discovery-feedback][file an issue on the Go issue tracker]], or email
 [[mailto:go-discovery-feedback@google.com][go-discovery-feedback@google.com]]
 so that we can work with you directly!