[SPARK-33472][SQL][FOLLOW-UP] Update RemoveRedundantSorts comment

### What changes were proposed in this pull request?
This PR is a follow-up for #30373 that updates the comment for RemoveRedundantSorts in QueryExecution.

### Why are the changes needed?
To update an incorrect comment.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
N/A

Closes #30584 from allisonwang-db/spark-33472-followup.

Authored-by: allisonwang-db <66282705+allisonwang-db@users.noreply.github.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

Author: allisonwang-db

sql/core/src/main/scala/org/apache/spark/sql/execution/QueryExecution.scala

@@ -344,7 +344,7 @@ object QueryExecution {
       PlanSubqueries(sparkSession),
       RemoveRedundantProjects,
       EnsureRequirements,
-      // `RemoveRedundantSorts` needs to be added before `EnsureRequirements` to guarantee the same
+      // `RemoveRedundantSorts` needs to be added after `EnsureRequirements` to guarantee the same
       // number of partitions when instantiating PartitioningCollection.
       RemoveRedundantSorts,
       DisableUnnecessaryBucketedScan,