Remove useless comment

Author: szehon-ho

api/src/main/java/org/apache/iceberg/expressions/ExpressionUtil.java

@@ -171,9 +171,7 @@ public static Expression extractByIdInclusive(
 
   /**
    * Returns an expression that retains only predicates which reference one of the given field IDs.
-   * Predicates that do not reference any of the given IDs are replaced with alwaysTrue(). Used to
-   * preserve filters on non-primitive columns (e.g. map, array) that cannot be pushed down via
-   * partition projection.
+   * Predicates that do not reference any of the given IDs are replaced with alwaysTrue().
    *
    * @param expression a filter expression
    * @param schema schema for binding references