docs: public ListStackSetsResult withSummaries(StackSetSummary... summaries) {
          if (this.summaries == null) {
              setSummaries(new com.amazonaws.internal.SdkInternalList<StackSetSummary>(summaries.length));
          }
          for (StackSetSummary ele : summaries) {
              this.summaries.add(ele);
          }
          return this;
      }