`ListSexp` example on guide

[daniellga]

If I understood correctly, OwnedListSexp should have it's named argument set to true for this example to work.

OwnedListSexp's new() is different than other types; the second argument (named) indicates whether the list is named or unnamed. If false, the list doesn't have name and all operations on name like set_name() are simply ignored.

[Hiroaki Yutani]

Thanks for catching, yes!