Make the PR template less unfriendly (#14697)

Dunno how to feel about this. I want to guide people, but i don't want HTML comments in my `git log`

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,20 +1,14 @@
-<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
 ## Summary of the Pull Request
 
-<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> 
-## References
+## References and Relevant Issues
 
-<!-- Please review the items on the PR checklist before submitting-->
-## PR Checklist
-* [ ] Closes #xxx
-* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
-* [ ] Tests added/passed
-* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
-* [ ] Schema updated.
-* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
-
-<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
 ## Detailed Description of the Pull Request / Additional comments
 
-<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
 ## Validation Steps Performed
+
+## PR Checklist
+- [ ] Closes #xxx
+- [ ] Tests added/passed
+- [ ] Documentation updated
+   - If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
+- [ ] Schema updated (if necessary)