[Changelog] Add export matches feature security center (#17024)

* [Changelog] Add export matches feature security center

* Fixing identation

* Fixing identation 2

Author: Maddy-Cloudflare

src/content/changelogs/security-center.yaml

@@ -12,3 +12,7 @@ entries:
   - publish_date: "2024-09-19"
     description: |-
       - Customers can now create a `security.txt` file file to provide the security research team with a standardized way to report vulnerabilities. 
+
+  - publish_date: "2024-09-23"
+    description: |-
+      - Customers can now export all matches from a saved query. Select your **Query name** > select the three dots > **Export matches**.