Update changelog

Author: mtojek

packages/system/changelog.yml

@@ -1,9 +1,9 @@
 # newer versions go on top
 - version: "0.13.3"
   changes:
-    - description: Fix unneeded unit and metric type for field
+    - description: Fix unneeded unit and metric type for field groups
       type: bugfix
-      link: https://github.com/elastic/integrations/pull/?
+      link: https://github.com/elastic/integrations/pull/1114
 - version: "0.13.2"
   changes:
     - description: Fix security pipeline to support string event.code.