It looks like any edit bumps the topic back to top. It appears that bumping it with an additional reply is not required. It may however still be useful at times, to create a reply that describes the changes made.
Good practice would be to at least provide a reason when making edits:
Top right pencil icon to click
becomes an input for edit reason
which will be displayed with revision overview
Edit: I do wish there was a way to undo revisions, instead of creating a new edit to remove the changes manually.