I know there is a conversion underway, but in the event no one knows:
1) http://www.postgresql.org/docs/9.1/interactive/index.html
2) Search for 'SUPERUSER'
3) 'Your search for superuser returned no hits.'
4) - - Click the Home link -- you remain in search ... or
- - - - Click the Documentation link -- displayed are Online manuals
range from 7.4 to 8.3