BUG #6151: documentation claims that default value for log_timezone is "unknown"

The following bug has been logged online:

Bug reference:      6151
Logged by:          Christoph Anton Mitterer
Email address:      calestyo@scientia.net
PostgreSQL version: 9.0
Operating system:   Debian sid
Description:        documentation claims that default value for log_timezone
is "unknown"
Details:

The documentation tells
(http://www.postgresql.org/docs/9.0/static/runtime-config-logging.html#GUC-L
OG-TIMEZONE) that the default for log_timezone is "unknown".
It seems however that this is rather "localtime".

(This possibly also appears in the default postgres.conf)

Cheers,
Chris.