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.
To be exact, `-item` is only used for when the item reveals itself.

Other moves only reveal items when they're trying to change the item, which falls under then "changed" part.

This could possibly be rewritten to be clearer.