Fix a broken link which has changed on the JSON Schema website.

This new link seems a bit wrong and likely to change again to me, but
for now, the old link is a 404...

Refs: json-schema-org/website#955

docs/faq.rst

@@ -56,10 +56,9 @@ Difficult as this may sound for new users, at this point it at least means they
 
 .. seealso::
 
-    `Draft 2019-09's release notes on format <https://json-schema.org/draft/2019-09/release-notes.html#format-vocabulary>`_
+    `Draft 2019-09's release notes on format <https://json-schema.org/draft/2019-09#draft-2019-09-release-notes>`_
 
-        for upstream details on the behavior of format and how it has changed
-        in ``draft2019-09``
+        for upstream details on the behavior of format and how it has changed in ``draft2019-09``
 
     `validating formats`