message: Fix Popover usePortal type definition
diff: @@ -99,6 +99,13 @@ interface IPopover {
  * Callback fired when the popover closes
  */
  onClose?: () => void;
  + /**
  + * If true the popover is displayed with a Portal.
  + * Rendering content inside a Portal allows the popover content
  + * to escape the physical bounds of its parent while still being
  + * positioned correctly relative to its target
  + */
  + usePortal?: boolean;
  }
  type PopoverProps = IPopover & PopoverChildren;
  