Fixed Timer documentation.

      /// It returns the elapsed time (in seconds) between calling the start() and stop() methods.

      /// Starts counting the real time after the method start() is called and

      /// pauses when the method stop() is called.

      /// If the timer have been started more then once without resetting,

      /// If the timer has been started more then once without resetting,

      /// the real time is counted by adding all intervals (between start and stop

      /// methods) together.

      /// This function can be called while the timer is running, there is no