The purpose of bumping changes to the front page is to allow for early peer review. Marking something as a trivial edit has been discussed over on mSO before and always declined.
References
- could-we-have-the-ability-to-mark-a-change-as-minor-in-questions-or-answerscould-we-have-the-ability-to-mark-a-change-as-minor-in-questions-or-answers
- feature-request-trivial-edit-checkboxfeature-request-trivial-edit-checkbox
In general editing is positively encouraged, we have several badges for it and other community janitorial work. Some forms of editing are frowned upon, though if you are making a substantial improvement to a post then you should be OK.
Don't worry too much about it, if it irritates sufficiently you'll get a gentle nudge in the right direction I'm sure.