message: update dialog description
diff: @@ -6,6 +6,8 @@ import {Button, Dialog, Box, Text} from '@primer/components'
  The dialog component is used for all modals. It renders on top of the rest of the app with an overlay.
  +**Note:** You'll need to manage the `isOpen` state in a wrapper component of your own. For documentation purposes only we've created a mock `State` to handle this, but you should handle the state in the component you consume `Dialog` in or in a wrapper component.
  +
  <State default={false}>
  {([isOpen, setIsOpen]) => (
  