remove useless comments

Author: xudong963

datafusion/core/tests/physical_optimizer/enforce_distribution.rs

@@ -37,7 +37,6 @@ async fn apply_enforce_distribution_multiple_times() -> Result<()> {
     let ctx = SessionContext::new_with_config(config);
 
     // Create table schema and data
-    // To reproduce to bug: the LOCATION should contain more than one aggregate_test_100.csv
     let sql = "CREATE EXTERNAL TABLE aggregate_test_100 (
         c1  VARCHAR NOT NULL,
         c2  TINYINT NOT NULL,