I keep seeing people leave the wrapping parentheses, like `(Added)` in
their release notes.
This PR tries making it clearer that we only want *one* of "Added",
"Fixed", or "Improved".
Release Notes:
- N/A
This PR removes the placeholder description from the PR template, opting
to just leave empty space instead.
I've seen lots of instances where authors will not delete the
placeholder, and it ends up in Git history, which is not desirable.
Release Notes:
- N/A
