Update importing_blockchain.md
Created by: jcklasseter
With the most recent gui release download for windows 10 from https://getmonero.org/downloads/ (Lithium Luna) the supported relevant command line option is:
--guard-against-pwnage arg (=1) Verify blocks and transactions during
import (only disable if you exported
the file yourself)
Since --verify 1 is not only not supported anymore, but is default behavior it is misleading and should be removed from the guide.