I am just telling you that in your officiall documentation i didn't find that command.
What command? Both OWNED BY and OWNER TO are parts of the ALTER SEQUENCE command and written and described on the page you were reading when you filled out the form.
Note that our current release is 9.5 with 10.0 in beta. Our search results have a tendency to show old versions (you were reading 8.4) so ensuring that you are on current stuff helps.
I founded oj stack owerflow and when i changed command I succesfully changed owner. Also one more hit: documentation will be much better with examples. I am DBA for a 7 years on ms sql and oracle and they have examples which can make life more easily if you are starting with some new tehnologies like postgres.
Personally I tend to find well written prose and syntax specifications to be sufficient but I don't doubt that examples are helpful. For better and worse this is a freely available open-source product. We don't have a mandate that every feature have 6 examples documented for its use. The volume of questions raised about ALTER SEQUENCE is so low that the motivation to dream up and add new examples just isn't there. If a patch was submitted, though, it would likely be committed.
