Versioning policy and pg_upgrade

I noticed that the versioning policy page
(http://www.postgresql.org/support/versioning) mentions that for
upgrading between major versions, a dump/reload of the database is
needed. Might we want to add a note in there about the use of
pg_upgrade when upgrading from 8.3+ to 8.4+? I think some potential
users might see a dump/reload as a deal-breaker.

--
Thom Brown
Registered Linux user: #516935