docs: public DescribeMatchmakingRuleSetsResult withRuleSets(MatchmakingRuleSet... ruleSets) {
          if (this.ruleSets == null) {
              setRuleSets(new java.util.ArrayList<MatchmakingRuleSet>(ruleSets.length));
          }
          for (MatchmakingRuleSet ele : ruleSets) {
              this.ruleSets.add(ele);
          }
          return this;
      }