Migrate help recommends patch already in D6.16

The configuration help at /help/migrate/configuration states:

node_delete() unnecessarily caches the node being deleted - when hundreds or thousands of nodes are deleted in a single request, you can very quickly run out of memory. Go to issue #287063 and apply the patch in comment #8 to prevent this caching.

But the referenced patch is already part of D6.16, so this should be removed or the fixed D6 release noted.