go1.14beta1: fix link to release notes

Change-Id: I1e3a9e2ce449fe106194cc4c9ac918180821c15a
Reviewed-on: https://go-review.googlesource.com/c/dl/+/211697
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/go1.14beta1/main.go b/go1.14beta1/main.go
index 8e6f1b9..19526fa 100644
--- a/go1.14beta1/main.go
+++ b/go1.14beta1/main.go
@@ -12,7 +12,7 @@
 // And then use the go1.14beta1 command as if it were your normal go
 // command.
-// See the release notes at https://golang.org/doc/go1.14beta1
+// See the release notes at https://tip.golang.org/doc/go1.14
 // File bugs at https://golang.org/issues/new
 package main