code: public MoneyFormatterBuilder appendAmount() {
          AmountPrinterParser pp = new AmountPrinterParser(MoneyAmountStyle.ASCII_DECIMAL_POINT_GROUP3_COMMA);
          return appendInternal(pp, pp);
      }
docs: Appends the amount to the builder using a standard format.
  <p>
  The format used is {@link MoneyAmountStyle#ASCII_DECIMAL_POINT_GROUP3_COMMA}.
  The amount is the value itself, such as '12.34'.
  
  @return this, for chaining, never null