Brief summary of issue / Description of requested feature:

Improve PTB changelogs to say "added/improved/fixed" categories when PRs start getting such categories themselves

Steps to reproduce the issue / Reasons for adding feature:

1. More clarity for PTB users,
2. Clearer/neater output

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

The https://github.com/Mudlet/Mudlet/blob/development/CI/generate-ptb-changelog.lua script would need to be updated for this.