Revert CalciteToolsHelper comment to sync with main

Signed-off-by: Kai Huang <ahkcs@amazon.com>

Author: ahkcs

core/src/main/java/org/opensearch/sql/calcite/utils/CalciteToolsHelper.java

@@ -422,8 +422,7 @@ public RelNode visit(TableScan scan) {
             }
           };
       rel = rel.accept(shuttle);
-      // Context classloader is set by callers (QueryService.executeWithCalcite/explainWithCalcite)
-      // to support patched Calcite (CALCITE-3745) Janino compilation.
+      // the line we changed here
       try (Connection connection = context.connection) {
         final RelRunner runner = connection.unwrap(RelRunner.class);
         PreparedStatement preparedStatement = runner.prepareStatement(rel);