docs:update PULL_REQUEST_TEMPLATE.md

[fuyuwei01]

PR Type

Describe what this PR does for and how you did.

Adding the issue link (#xxx) if possible.

Note

Checklist

• [ ] Add information of this PR to CHANGELOG.md in root of project.
• [ ] Add documentation in javadoc or comment below the PR if necessary.

Checklist (Optional)

• [ ] Will pull request to branch of 2023.
• [ ] Will pull request to branch of 2022.
• [ ] Will pull request to branch of 2021.
• [ ] Will pull request to branch of 2020.
• [ ] Will pull request to branch of hoxton.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.68%. Comparing base (64cc79b) to head (ede5a6d). Report is 1 commits behind head on 2021.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2021 #1384 +/- ## ============================================ + Coverage 64.66% 64.68% +0.02% Complexity 2 2 ============================================ Files 322 322 Lines 7522 7519 -3 Branches 911 911 ============================================ Hits 4864 4864 + Misses 2246 2243 -3 Partials 412 412 ```

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