code: public ReceiptTemplateBuilder addAdjustment(String name, BigDecimal amount) {
  		Adjustment adjustment = new Adjustment(name, amount);
  		return this.addAdjustment(adjustment);
  	}
docs: Adds an {@link Adjustment} to this builder. Adjustments allow a way to
  insert adjusted pricing (e.g., sales). Adjustments are optional.
  
  @param name
  the name of the adjustment.
  @param amount
  the amount of the adjustment.
  @return this builder.