Being new to the Suggested Edits Reviewer role, I've only done a few. I've approved some that were simple grammar and spelling corrections, but they were so extensive they definitely seemed appropriate. However yesterday I saw the first one I would consider trivial. Two changes were made: a double 'the' was corrected and a forgotten word added. This was in a rather long answer with a codeblock (not edited) in it.
Technically it's a valid edit. It's not a single character, it does correct something... but imho it's still a "tiny, trivial edit". It wasn't an old question, so I'm not looking at issues of bumping. And just for clarity, the edit was not by the answerer nor (I'm pretty sure) the asker.
This also speaks to some edits I have seen that are simple capitalization or reversed letter corrections in question titles, etc. Not edits requiring review, but ones that caught my eye as 'did that really need to be done, or "substantially improve" the post?' Unless you're already in there for tagging or something, or it's a key word for a search. Second languages are a given here, and if there are a lot of grammatical or spelling changes that could help improve understanding or just make it easier to read in English (and run through a translator?), I'm all for it. But if the intent and meaning is perfectly clear and there are just a couple of words out of order or a type-o or something, they seem unwarranted and even if they're technically correct I would be inclined to reject the edit.
In the end I chose to skip, because I wasn't sure if I should just accept it or go ahead and reject it - I don't know where that line is.