docs: update PR template

.github/pull_request_template.md

@@ -1,10 +1,9 @@
-Checklist:
-
-* [ ] My organization is added to [USERS.md](https://github.com/argoproj/argo-workflows/blob/master/USERS.md).
-
 Tips:
 
+* Maybe add you organization to [USERS.md](https://github.com/argoproj/argo-workflows/blob/master/USERS.md).
 * Your PR needs to pass the required checks before it can be approved. If the check is not required (e.g. E2E tests) it does not need to pass
 * Sign-off your commits to pass the DCO check: `git commit --signoff`.
 * Run `make pre-commit -B` to fix codegen or lint problems. 
 * Say how how you tested your changes. If you changed the UI, attach screenshots.
+* If changes were requested, and you've made them, then dismis the review to get it looked at again.
+* You can ask for help!