some config options do not have defaults documented

Alvaro Herrera <alvherre@alvh.no-ip.org> writes:

I just noticed that logging_collector does not have its default value
documented. I checked and other settings were also missing defaults.
Do we have a policy that they should all be documented, or is this
intentional?

I think if the default value isn't pretty obvious, it should be
documented. Offhand I would've said most or all GUC descriptions
already did include it.

regards, tom lane