The following bug has been logged on the website:
Bug reference: 12889
Logged by: Adalbert Delong
Email address: herzir232(at)seznam(dot)cz
PostgreSQL version: 9.1.0
Operating system: Debian 7.8
Description:
Sorry, I don't know where documentation errors can be reported.
Documentation PDF for PSQL 9.1, page 329 (394 in pdf), subsection 13.2,
table 13-1 and the paragraph following give contradictory information about
isolation levels.