Add changelog

Author: maxvp

src/content/changelogs/gateway.yaml

@@ -5,6 +5,10 @@ productLink: "/cloudflare-one/policies/gateway/"
 productArea: Cloudflare One
 productAreaLink: /cloudflare-one/changelog/
 entries:
+  - publish_date: "2024-10-04"
+    title: Expanded Gateway log fields
+    description: |-
+      Gateway now offers new fields in [activity logs](/cloudflare-one/insights/logs/gateway-logs/) for DNS, network, and HTTP policies to provide greater insight into your users' traffic routed through Gateway.
   - publish_date: "2024-09-30"
     title: File sandboxing
     description: |-