puzzled by the docs

The PostgreSQL Administrator's Guide which appears on the web
http://www.postgresql.org/docs/admin/index.html
is fairly different from the one which is packed with
the 7.0.2 distribution.

Which is the good one?

I'm puzzled because the web version mentions the release 7.0.2
(the other one, doesn't).
And the section 'Logging and Debuging' (in chap. 7 from the web version),
mentions a 'postgres.conf'  configuration file, some settings that are
of interest for me (as 'LOG_PID' and 'LOG_TIMESTAMP')....
but the distributed doc, instead, speaks of the 'pg_option' file,
and doesn't mention those settings...

Help! Am I missing something stupid?

Hernan Gonzalez
Buenos Aires, Argentina