pkg.conf.5: PUBKEY is not deprecated. Also add some hints about pkg-repo(8)
pkg.conf.5: PUBKEY is not deprecated. Also add some hints about pkg-repo(8)

Reported by:	zi

Open343/pkg,junovitch/pkg,junovitch/pkg,skoef/pkg,khorben/pkg,en90/pkg,en90/pkg,khorben/pkg,khorben/pkg,skoef/pkg,Open343/pkg