build: Copy-pasteable command to check artifact was published (#32837)

Author: johanandren

akka-docs/release-train-issue-template.md

@@ -33,7 +33,7 @@ Key links:
 
 - [ ] Check [API](https://doc.akka.io/api/akka-core/$VERSION$/) documentation
 - [ ] Check [reference](https://doc.akka.io/libraries/akka-core/$VERSION$/) documentation. Check that the reference docs were deployed and show a version warning (see section below on how to fix the version warning).
-- [ ] Check the release on https://repo.akka.io/TOKEN/secure/com/typesafe/akka/akka-actor_2.13/$VERSION$/akka-actor_2.13-$VERSION$.pom
+- [ ] Check the release `mvn dependency:get -Dartifact=com.typesafe.akka:akka-actor_2.13:$VERSION$` 
 
 ### When everything is on https://repo.akka.io/TOKEN/secure
   - [ ] Log into `gustav.akka.io` as `akkarepo`