Add an example in Github PR comment

.github/workflows/require-checklist.yaml

@@ -21,6 +21,13 @@ jobs:
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
-              body: `## Validation steps
-              - [ ] Ensure any new images have repository and tag on the same level to ensure the rancher-images.txt is generated correctly for it for airgap scenarios.`,
+              body: `## Validation steps [CI won't pass without checking this checkbox]
+              - [ ] Ensure all container images have repository and tag on the same level to ensure that all container images are included in rancher-images.txt which are used by airgap customers.
+              
+              <pre>
+              Ex:- 
+                longhorn-controller:
+                   repository: rancher/hardened-sriov-cni
+                   tag: v2.6.3-build20230913
+              </pre>`,
             })