I used my human eyes to submit updates to Redis and Git, fixing typos in comments.

Sure it's low-hanging fruit, but if you're looking at the code it's good to have the comments be readable and not full of typos.

(That said this was a few years ago, and there were no LLMs at that point. I didn't go out of my way to make trivial contributions, but I figured since I saw the "problems" I should submit a patch to fix them.)