Remove reference to step-18

diff --git a/include/deal.II/grid/filtered_iterator.h b/include/deal.II/grid/filtered_iterator.h
index 4f8dd04e4b56fd99c902c81f08e4fb5650a7d7a0..654bfa0ec5b07fa916e6c4ac8dcbf43aacc24366 100644 (file)
--- a/include/deal.II/grid/filtered_iterator.h
+++ b/include/deal.II/grid/filtered_iterator.h
@@ -349,7 +349,7 @@ namespace IteratorFilters
  * functions are called with a pair of iterators denoting a range on which
  * they shall act, by choosing a filtered iterator instead of usual ones.
  *
- * This class is used in step-18 and step-32.
+ * This class is used in step-32.
  *
  *
  * <h3>Predicates</h3>