Generally those are small "invisible" improvements to functionality and accessibility, plus minor changes or additions to the text (e.g. I recently added a new footnote). As for the emails, that's annoying—I thought only devlog posts triggered emails, and that just updating the files was a silent process. I'll batch changes from now on so people aren't spammed with minor upgrades.
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Thanks for the reply! This is good info. It's not like it's been a problem to download whatever's the lastest, I'll do it whenever, just got real curious
It seems to not trigger a whole email each specific update, at least; itch looks like it batches updates in a particular time frame into one email (don't know the time frame or if there's a max number per email, looks like it might be three)