Modify FF rollout template to be more specific

.gitlab/issue_templates/Feature Flag Roll Out.md

@@ -41,7 +41,7 @@ If applicable, any groups/projects that are happy to have this feature turned on
 - [ ] Enable on GitLab.com by running chatops command in `#production` (`/chatops run feature set feature_name true`)
 - [ ] Cross post chatops Slack command to `#support_gitlab-com` ([more guidance when this is necessary in the dev docs](https://docs.gitlab.com/ee/development/feature_flags/controls.html#where-to-run-commands)) and in your team channel
 - [ ] Announce on the issue that the flag has been enabled
-- [ ] Remove feature flag and add changelog entry
+- [ ] Remove feature flag and add changelog entry. Ensure that the feature flag definition YAML file has been removed in the **same MR** that is removing the feature flag from the code
 - [ ] After the flag removal is deployed, [clean up the feature flag](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) by running chatops command in `#production` channel
 
 ## Rollback Steps