Update pull request template h1 to h2

# Summary

## Summary

Briefly describe the main purpose and scope of this PR.

# Related Issue

## Related Issue

Reference the related issue(s) by number.

[//]: # (- fixes #456)

# Changes

## Changes

List the specific modifications made in this PR.

Focus on *what* was changed without going into detail about impact.

-

# Benefits

## Benefits

Describe the advantages or improvements brought by these changes.

Explain how these changes affect the project, users, or performance.

# Checklist

## Checklist

- [ ] Did you add a changelog entry to the *CHANGES.md*?

- [ ] Did you write some relevant docs about this change (if it's a new feature)?

- [ ] Did you write some tests for this change (if it's a new feature)?

- [ ] Did you run `deno task test-all` on your machine?

# Additional Notes

## Additional Notes

Include any other information, context, or considerations.