docs: minor comment update

isthmus/src/main/java/io/substrait/isthmus/SubstraitRelNodeConverter.java

@@ -276,7 +276,7 @@ private AggregateCall fromMeasure(Aggregate.Measure measure) {
     List<Integer> argIndex = new ArrayList<>();
     for (RexNode arg : arguments) {
       // arguments are guaranteed to be RexInputRef because of the prior call to
-      // AggregateValidator.AggregateTransformer.transformToValidCalciteAggregate
+      // transformToValidCalciteAggregate
       argIndex.add(((RexInputRef) arg).getIndex());
     }