Documentation bug for createSequence

The manual claims that the attribute ordered is supported for "informix, hsqldb, postgresql, oracle, firebird, h2"

http://www.liquibase.org/documentation/changes/create_sequence.html

However this is wrong for Postgres.

Postgres does not support the “ordered” attribute and when trying to run a changeSet that uses it, you get:

ordered is not allowed on postgresql, test.xml::1::hans