chore: Update PR template format (#6077)

Author: joaquim-verges

.github/pull_request_template.md

@@ -1,12 +1,15 @@
----
-title: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"
----
+<!--
+
+## title your PR with this format: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"
 
 If you did not copy the branch name from Linear, paste the issue tag here (format is TEAM-0000):
 
 ## Notes for the reviewer
+
 Anything important to call out? Be sure to also clarify these in your comments.
 
 ## How to test
+
 Unit tests, playground, etc.
 
+-->