Back in the day, one of the co-founders here would regularly fix up my typos.
For something like fixing formatting, I think people would be happy. The bigger question is whether they will be able to discern from the edit just what it was that you did so that they’ll know what to do next time.
Here, TL3 users can edit titles and categories. It’s rare that I’ve had someone complain.
What’s appropriate for your community, I can’t guess. Maybe they’ll think “Cool! Now I know how todo that” or maybe they’ll think something else.