Update pull_request_template.md (#5237)

# Pull Request Template
<!-- Please include a summary of the changes and the related issue.
Please also include relevant motivation and context. List any
dependencies that are required for this change. -->

NA

**Type of change**
<!-- Please delete options that are not relevant. Remember to title the
PR according to the type of change -->

- Bug fix (non-breaking change which fixes an issue)
- New feature (non-breaking change which adds functionality)
- Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- Refactor (change restructuring the codebase without changing
functionality)
- Improvement (change adding some improvement to an existing
functionality)
- Documentation update

**How Has This Been Tested**
<!-- Please add some reference about how your feature has been tested.
-->

**Checklist**
<!-- Please go over the list and make sure you've taken everything into
account -->

- I added relevant documentation
- I followed the style guidelines of this project
- I did a self-review of my code
- I made corresponding changes to the documentation
- I confirm My changes generate no new warnings
- I have added tests that prove my fix is effective or that my feature
works
- I have added relevant notes to the CHANGELOG.md file (See
https://keepachangelog.com/)

.github/pull_request_template.md

@@ -1,4 +1,4 @@
-# Pull Request Template
+# Description
 <!-- Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change. -->
 
 Closes #<issue_number>
@@ -25,4 +25,4 @@ Closes #<issue_number>
 - I made corresponding changes to the documentation
 - I confirm My changes generate no new warnings
 - I have added tests that prove my fix is effective or that my feature works
-- I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)
+- I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)