docs: public static String phone() {
          StringBuilder result = new StringBuilder();
          
          result.append("(")
          	.append(RandomInteger.nextInteger(111, 999))
          	.append(") ")
      		.append(RandomInteger.nextInteger(111, 999))
      		.append("-")
      		.append(RandomInteger.nextInteger(0, 9999));
  
          return result.toString();
      }