docs: public void setRelationalDatabaseAvailabilityZones(java.util.Collection<AvailabilityZone> relationalDatabaseAvailabilityZones) {
          if (relationalDatabaseAvailabilityZones == null) {
              this.relationalDatabaseAvailabilityZones = null;
              return;
          }
  
          this.relationalDatabaseAvailabilityZones = new java.util.ArrayList<AvailabilityZone>(relationalDatabaseAvailabilityZones);
      }