title: grails remoteFunction update attribute
body: <p>The Grails documentation for the remoteFunction update attribute states:</p>
  
  <p>update (optional) - Either a Map containing the elements to update for 'success' or 'failure' states, or a string with the element id to update, in which case failure events would be ignored</p>
  
  <p>I'm a little confused why the indicate a Map and not a List here, is this wrong?   I imagine I want my remote action to return a Map, where the keys match the name of the list elements specified in the update attribute??</p>
  
  <p>Thanks</p>