design/25530-sumdb: fix broken link to note package

The note package moved from /x/exp/notary to a new home for 1.13. Fix
the godoc link.

Change-Id: I54be34847dd2decf46f6768764ac9f0852335dcf
Reviewed-by: Filippo Valsorda <>
diff --git a/design/ b/design/
index c1f1647..f6ee726 100644
--- a/design/
+++ b/design/
@@ -287,7 +287,7 @@
 - `GOSUMDB=<sumdb-key>` sets the Go checksum database to use,
   where `<sumdb-key>` is a verifier key as defined in
-  [package note](
+  [package note](
 - `GONOSUMDB=prefix1,prefix2,prefix3` sets a list of module path prefixes,
    again possibly containing globs, that should not be looked up using the database.