Update PR template

.github/pull_request_template.md

@@ -1,31 +1,7 @@
-# Which issue does this PR close?
+## Rationale
 
-Closes #
 
-# Rationale for this change
-
-<!---
- Why are you proposing this change? If this is already explained clearly in the issue, then this section is not needed.
- Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes.
--->
+## Detailed Changes
 
-# What changes are included in this PR?
 
-<!---
-There is no need to duplicate the description in the issue here, but it is sometimes worth providing a summary of the individual changes in this PR to help reviewers understand the structure.
--->
-
-# Are there any user-facing changes?
-
-<!---
-Please mention if:
-
-- there are user-facing changes that need to update the documentation or configuration.
-- this is a breaking change to public APIs
--->
-
-# How does this change test
-
-<!-- 
-Please describe how you test this change (like by unit test case, integration test or some other ways) if this change has touched the code.
--->
+## Test Plan