doc: clarify that NetPermissionFlags::Implicit is only about whitelists
doc: clarify that NetPermissionFlags::Implicit is only about whitelists

Co-authored-by: Jon Atack <44f878afe53efc66b76772bd845eb65944ed8232@atack.com>

fanquake/bitcoin,particl/particl-core,particl/particl-core,tecnovert/particl-core,particl/particl-core,bitcoin/bitcoin,particl/particl-core,particl/particl-core,tecnovert/particl-core,fanquake/bitcoin,bitcoin/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,bitcoin/bitcoin,tecnovert/particl-core,tecnovert/particl-core,bitcoin/bitcoin,tecnovert/particl-core,particl/particl-core,fanquake/bitcoin,fanquake/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,fanquake/bitcoin