fix: spelling in the PR template (#187)

Fixed a typo and added testing in the Proof heading

Signed-off-by: Evan Baker <rbtr@users.noreply.github.com>
Co-authored-by: Jacques I Massa <jac.massa0908@gmail.com>

.github/pull_request_template.md

@@ -8,15 +8,15 @@ If this pull request is related to any issue, please mention it here. Additional
 
 ## Checklist
 
-- [ ] I have read the [contributing documantation](https://retina.sh/docs/contributing).
+- [ ] I have read the [contributing documentation](https://retina.sh/docs/contributing).
 - [ ] I signed and signed-off the commits (`git commit -S -s ...`)
 - [ ] I have correctly attributed the author(s) of the code.
 - [ ] I have tested the changes locally.
 - [ ] I have followed the project's style guidelines.
 - [ ] I have updated the documentation, if necessary.
 - [ ] I have added tests, if applicable.
 
-## Screenshots (if applicable)
+## Screenshots (if applicable) or Testing Completed
 
 Please add any relevant screenshots or GIFs to showcase the changes made.