POD suggests it's impossible to verify server-side SSL certificates

[akarelas]

In https://metacpan.org/pod/DBD::Pg , it says:

"There are four valid arguments to the sslmode parameter, which controls whether to use SSL to connect to the database:"

So there are two issues:

1. "There are four" implies to many people that there are not five or more
2. The very important option to verify server SSL certificate (sslmode=verify-full;sslrootcert=system) is missing from the list of the four valid arguments.

[esabol]

I suspect this POD text was written before PostgreSQL 8.4 was released. Going by the PostgreSQL documentation, 8.4 was the first version to add support for sslmode=verify-full and sslmode=verify-ca.

DBD::Pg claims to support PostgreSQL 8.0 or higher, so the project can't just add the newer sslmode options to the POD without mentioning they only apply to PostgreSQL version 8.4 or higher.

Anyone want to draft up what it should say?

[akarelas]

Maybe also include instructions for where to find the full list of options, to make the POD future-proof