adding more strict release note language

.github/PULL_REQUEST_TEMPLATE.md

@@ -26,10 +26,12 @@ Fixes #
 
 **Special notes for your reviewer**:
 
-**Release note**:
-<!--  Write your release note:
-1. Enter your extended release note in the below block. If the PR requires additional action from users switching to the new release, include the string "action required".
-2. If no release note is required, just write "NONE".
+**Does this PR introduce a user-facing change?**:
+<!--  
+If no, just write "NONE".
+If yes, a release note is required:
+Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
+2. 
 -->
 ```release-note