Add PR link in changelog

Author: moxarth-rathod

packages/checkpoint_email/changelog.yml

@@ -3,7 +3,7 @@
   changes:
     - description: Enable Agentless deployment.
       type: enhancement
-      link: https://github.com/elastic/integrations/pull/1
+      link: https://github.com/elastic/integrations/pull/15450
 - version: "1.2.0"
   changes:
     - description: Populate additional ECS fields for the event types `phishing`, `spam`, and `malicious_url`.