Summary

Update templates

Linked issue

n/a

Changes

Checklist

• Tests added or updated (or N/A with reason)
• Docs / types updated if public API changed (index.d.ts and index.d.cts)
• No breaking changes (or called out explicitly above)

Summary by cubic

Standardizes GitHub issue and PR templates to use H2 headings for clearer structure and consistency. No code or runtime changes.

Description

• Summary of changes
  • Switched template headings from H4 (####) to H2 (##) in .github/ISSUE_TEMPLATE.md and .github/PULL_REQUEST_TEMPLATE.md.
  • Kept section names the same; only heading level changed.
• Reasoning
  • Improve readability and scanning.
  • Align with common GitHub template conventions.
• Additional context
  • No linked issue. Repo behavior is unchanged.

Docs

Update /docs/ contribution guidelines to reflect the H2 section headings shown in the updated templates.

Testing

No tests added. Not needed since changes affect only GitHub templates and have no impact on code or behavior.

Semantic version impact

None. No public API or package changes; no release required.

^{Written for commit 93714d7. Summary will update on new commits.}