
sec.privilegeSetName( action as String, kind as String, new-privilege-name as String ) as null
  Changes the sec:privilege-name of a sec:privilege to 
  $new-privilege-name.
  If a privilege with the given $action and $kind is not found, 
  an error is returned.
  If $new-privilege-name is not unique, an error is returned.
  
http://marklogic.com/xdmp/privileges/privilege-set-name
  This function must be executed against the security database.
// execute this against the security database
declareUpdate();   
const sec = require('/MarkLogic/security.xqy');
   
sec.privilegeSetName(
    "http://marklogic.com/xdmp/privileges/mypriv", 
    "execute", 
    "new_name")
// Renames the execute privilege with the specified action to "new_name."