fix(#1316) Disabled keys not passing isDisable prop to item (docs) (#1498)
* fix disabled keys not passing isDisable prop to item in useMenu doc
* update disabled key
* move disabled keys to props for `menu` component
* fix shorthand
Co-authored-by: Daniel Lu <dlu@livefyre.com>
Co-authored-by: Robert Snow <rsnow@adobe.com>