chore: Add reminder to tag reviewers to PR template (#2260)

## Description:
<!-- Describe this change, how it works, and the motivation behind it.
-->

## Is this change user facing?
YES/NO
<!-- If yes, please add the "user facing" label to the PR -->
<!-- If yes, don't forget to include docs changes where relevant -->

## References (if applicable):
<!-- Add relevant Github Issues, Discord threads, or other helpful
information. -->

.github/pull_request_template.md

@@ -1,10 +1,13 @@
-## Description:
+## Description
 <!-- Describe this change, how it works, and the motivation behind it. -->
 
+## REMINDER: Tag Reviewers, so they get notified to review
+
 ## Is this change user facing?
 YES/NO
 <!-- If yes, please add the "user facing" label to the PR -->
 <!-- If yes, don't forget to include docs changes where relevant -->
 
-## References (if applicable):
+## References (if applicable)
 <!-- Add relevant Github Issues, Discord threads, or other helpful information. -->
+<!-- You can auto-close issues by putting "Fixes #XXXX" here. -->