code: public static MessageUpdater updater(final String pathServiceSid, 
                                           final String pathChannelSid, 
                                           final String pathSid) {
          return new MessageUpdater(pathServiceSid, pathChannelSid, pathSid);
      }
docs: Create a MessageUpdater to execute update.
  
  @param pathServiceSid The service_sid
  @param pathChannelSid The channel_sid
  @param pathSid The sid
  @return MessageUpdater capable of executing the update