I completely agree the edit are entirely valid and improve the question. I still would have rejected as too minor. However, I would have used the Custom reason and explained that while the edits definitely improve the formatting and readability of the question, and would normally be accepted, the Question is a year old and there's no need to drag it up just to fix formatting.
TL;DR - Totally valid edit, but too minor considering the age of the question/answer.
Side note: This is the exact reason I'm an advocate of the "Minor Edit" Suggestion Flag"Minor Edit" Suggestion Flag. So that if you're just fixing formatting, you can check that box; and if a mod agrees that it's a minor edit they can also check a similar box, and the question doesn't get dragged up to the front page, but does get the fix.