docs: public Communication withAttachmentSet(AttachmentDetails... attachmentSet) {
          if (this.attachmentSet == null) {
              setAttachmentSet(new com.amazonaws.internal.SdkInternalList<AttachmentDetails>(attachmentSet.length));
          }
          for (AttachmentDetails ele : attachmentSet) {
              this.attachmentSet.add(ele);
          }
          return this;
      }