Fixed some wordings for -item, added info for -enditem

-item is no longer worded in a strange way, and is much more concise.

-enditem takes note of moves like Thief, which do not trigger -enditem.
Let me rephrase. Your phrasing implies that one condition we might see `-item` is if "The item has been revealed due to a move or ability". I'm pretty sure this never happens.