update pull request template (#9253)

Author: mangalaman93

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,14 +1,13 @@
-Title format:
+# Title format
 
- - `Topic(Area): Feature`
- - `Topic` must be one of `build|ci|docs|feat|fix|perf|refactor|chore|test`
- - `Area` must be one of `acl|audit|backup|badger|cdc|dql|export|graphql|indexing|multi-tenancy|raft|restore|upgrade|zero`
- - * Add [BREAKING] if it is a breaking change
+- `Topic(Area): Feature`
+- `Topic` must be one of `build|ci|docs|feat|fix|perf|refactor|chore|test`
+- `Area` must be one of `acl|audit|backup|badger|cdc|dql|export|graphql|indexing|multi-tenancy|raft|restore|upgrade|zero`
+- Add [BREAKING] if it is a breaking change
 
-------------------
-Body Format:
+# Body Format
 
-Description: <add description>
-Fixes: <GitHub Issue>
-Closes: <JIRA Issue>
-Docs: <docs PR>
+Description: {add description}
+Fixes: {GitHub Issue}
+Closes: {Linear Issue}
+Docs: {docs PR}