Tweak wordings for PR template

Co-authored-by: Ruby Lazuli <general@patchmixolydic.com>

Author: weihanglo

.github/PULL_REQUEST_TEMPLATE.md

@@ -14,14 +14,14 @@ Thanks for submitting a pull request 🎉! Here are some tips for you:
 * If your PR is not finished, set it as "draft" PR or add "WIP" in its title.
 * It's ok to use the CI resources to test your PR, but please don't abuse them.
 
-### What this PR tries to resolve?
+### What does this PR try to resolve?
 
 Explain the motivation behind this change.
 A clear overview along with an in-depth explanation are helpful.
 
 You can use `Fixes #<issue number>` to associate this PR to an existing issue.
 
-### How to test and review this PR?
+### How should we test and review this PR?
 
 Demonstrate how you test this change and guide reviewers through your PR.
 With a smooth review process, a pull request usually gets reviewed quicker.