I had a report from a user asking how they could VACUUM in the future
under 9.3, when it's no longer supported (which took me aback). He
referred me to a manual page:
http://www.postgresql.org/docs/current/static/sql-vacuum.html
I realized, then, that the problem is the wordsmithing of:
"This page in other versions: 9.2 / 9.1 / 9.0 / 8.4 | Unsupported
versions: 9.3 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3 / 7.2 / 7.1 / devel"
An entirely reasonable person would decide that the VACUUM command is
unsupported in any of the itemized versions.