If you look at the html after the change it would probably make more sense - there were 4 entries in the table, only Database statistics had a comment.

I believed this to be due to the us trying to make clear where the database statictics row started due to the mess of building the copy table row.

With the removal of the copy fields table row, we simplify the table so the file's actually readable - at which point it's silly to have the comment on 1 row and not the other 2, and it's not need to add a comment to the other two rows, as we now have a simple table that's readable..