option to log a change summary when updating KB articles

Sometimes a KB article is updated, it's just to fix typos or formatting. Other times it's to rewrite a section or clarify something.

It would be helpful to have a way for technicians to note, either for other technicians or for customers, what the last few sets of changes were.

I envision this not as a full changelog that could grow forever, but may be a text field, optionally technician-only, where a technician could summarize their changes.

Workaround: Technician could simply add a changelog paragraph at the end of the KB article.