message: Clarify doc for highlighted
diff: @@ -1119,7 +1119,9 @@ module.exports = React.createClass({
  const payload = {
  action: 'view_room',
  event_id: eventId,
  - // If an event ID is set (truthy), mark it as highlighted
  + // If an event ID is given in the URL hash, notify RoomViewStore to mark
  + // it as highlighted, which will propagate to RoomView and highlight the
  + // associated EventTile.
  highlighted: Boolean(eventId),
  third_party_invite: thirdPartyInvite,
  oob_data: oobData,
  