code: public Retryer<R> incrementingWait(final long initialSleepTime, final long increment) {
          checkArgument(initialSleepTime >= 0L, "initialSleepTime must be >= 0 but is %d", initialSleepTime);
          return withWaitStrategy(new WaitStrategy() {
  
              @Override public long computeSleepTime(int previousAttemptNumber, long delaySinceFirstAttemptInMillis) {
                  long result = initialSleepTime + (increment * (previousAttemptNumber - 1));
                  return result >= 0L ? result : 0L;
              }
          });
      }
docs: Sets the strategy that sleeps a fixed amount milliseconds after the first
  failed attempt and in incrementing amounts milliseconds after each additional failed attempt.
  
  @param initialSleepTime
  @param increment
  @return