Improve language in PR template

[joeyfigaro]

Summary

Small tweaks to the english used in the PR template.

Key Changes

• Improved checklist items to read more naturally/accurately

Check List

• The changes to the "Readme" file(if needed)
• The changes not breaking any old rule of the library or usage

---

New Template

### Summary

[What does this PR introduce?]


#### Key Changes

- [List the changes to look for in this PR]


### Check List

- [ ] Updates made to the "Readme" file (if needed)
- [ ] Changes do not introduce any regressions
- [ ] Changes do not break any old rule of the library