Typos etc.
Fragment of a discussion from User talk:Purodha
You have to click on "Side-by-Side" to open the diff view for the corresponding file, for example: https://gerrit.wikimedia.org/r/#/c/198300/1/includes/skins/SkinFallbackTemplate.php There you can see the comment (in this case on the right side, but it is also possible to add it to the left). You can also reply there. To publish a added comment you have to add a (empty) comment to the whole patch set.