[check_postgres] note to help others

[Greg Sabino Mullane]

> What I had to do to get the pg_service.conf file to work with nagios is 
> rename the file 'pg_service.conf' to '.pg_service.conf' and place it in /home/nagios.

Thanks, that's a good point, and the documentation is definitely wrong there. 
To further complicate things for anyone who wants to update the docs 
(hint, hint, other committers) is that .pg_service.conf is only available in 9.0 
or better: before that, it must be in /etc/pg_service.conf.

-- 
Greg Sabino Mullane greg at endpoint.com
End Point Corporation
PGP Key: 0x14964AC8
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