Code improvement

Description:
    Removed dead code and accidentally leftover code
Platforms tested:
    Linux/64 (jelly) - very minor

release_docs/RELEASE.txt

@@ -282,10 +282,10 @@ New Features
 
     C++ Library:
     ------------
-    - Added a wrapper for H5Ovisit2
+    - Added new function to the C++ interface
 
-      // Recursively visit elements reachable from this object.
-      void visit(H5_index_t idx_type, H5_iter_order_t order, visit_operator_t user_op, void *op_data, unsigned int fields);
+      Added wrapper for H5Ovisit2:
+          H5Object::visit()
 
       (BMR - 2019/02/14, HDFFV-10532)