Remove unnecessary comments that describe what code does

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: andygrove

spark/src/main/scala/org/apache/comet/parquet/CometParquetFileFormat.scala

@@ -133,13 +133,8 @@ class CometParquetFileFormat(session: SparkSession)
         isCaseSensitive,
         datetimeRebaseSpec)
 
-      // We still need the predicate in the conf to allow us to generate row indexes based on
-      // the actual row groups read
       val pushed = if (parquetFilterPushDown) {
         filters
-          // Collects all converted Parquet filter predicates. Notice that not all predicates
-          // can be converted (`ParquetFilters.createFilter` returns an `Option`). That's why
-          // a `flatMap` is used here.
           .flatMap(parquetFilters.createFilter)
           .reduceOption(FilterApi.and)
       } else {

spark/src/test/scala/org/apache/comet/parquet/ParquetReadSuite.scala

@@ -1837,7 +1837,6 @@ class ParquetReadV2Suite extends ParquetReadSuite with AdaptiveSparkPlanHelper {
       val scans = collect(r.filter(f).queryExecution.executedPlan) { case p: CometBatchScanExec =>
         p.scan
       }
-      // V2 Parquet scan acceleration is no longer active
       assert(scans.isEmpty)
     }
   }