Merge pull request #1088 from marc-vdm/improved_contributing_file

Updated and improved documentation for contributing to AB

.github/PULL_REQUEST_TEMPLATE.md

@@ -7,7 +7,8 @@ Contributors guide: ./CONTRIBUTING.md
 
 ## Checklist
 <!--
-Remove items that do not apply. For completed items, change [ ] to [x].
+Remove items that do not apply. For completed items, change [ ] to [x] or you can click the checkboxes once your 
+pull-request is published.
 -->
 
 - [ ] Keep pull requests small so they can be easily reviewed.
@@ -16,7 +17,9 @@ Remove items that do not apply. For completed items, change [ ] to [x].
 - [ ] Categorize the PR by setting a good title and adding one of the labels:
       `bug`, `feature`, `ui`, `change`, `documentation`, `breaking`, `ci`
       as they show up in the changelog
-- [ ] Link this PR to related issues.
+- [ ] Link this PR to related issues by using
+  [closing keywords](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue).
+- [ ] Request a review from another developer.
 
 <!--
 NOTE: these things are not required to open a PR and can be done afterwards,