docs: public ListReceiptRuleSetsResult withRuleSets(ReceiptRuleSetMetadata... ruleSets) {
          if (this.ruleSets == null) {
              setRuleSets(new com.amazonaws.internal.SdkInternalList<ReceiptRuleSetMetadata>(ruleSets.length));
          }
          for (ReceiptRuleSetMetadata ele : ruleSets) {
              this.ruleSets.add(ele);
          }
          return this;
      }