code: public static MessageUpdater updater(final String pathAccountSid, 
                                           final String pathSid, 
                                           final String body) {
          return new MessageUpdater(pathAccountSid, pathSid, body);
      }
docs: Create a MessageUpdater to execute update.
  
  @param pathAccountSid The SID of the Account that created the resources to
  update
  @param pathSid The unique string that identifies the resource
  @param body The text of the message you want to send
  @return MessageUpdater capable of executing the update