From the help center:
Tiny, trivial edits are discouraged - try to make the post significantly better when you edit, correcting all problems that you observe.
I often run across suggested edits in the review queue which seem quite trivial, often just correcting one or two punctuation or spelling mistakes. Sometimes the suggested edits aren't even fixing anything technically wrong, just adding a tiny word or something that makes it read better.
From the above quote it seems obvious that these are discouraged. But that doesn't say anything about what to do with these types of edits pop up in the review queue. Should I approve them?