Update PR template

Author: zhaoqizqwang

.github/pull_request_template.md

@@ -13,7 +13,7 @@
 ### How was this change tested?
 <!-- Describe your testing approach -->
 
-## Do we need integration tests and why?
+### Do we need integration tests and why?
 
 ### For Reviewers
 #### No PR should be approved if PR check fails. Author must provide reason for bypassing PR checks.