There's no need if you're just running a single server. Simply create two host entries both pointing to the same IP address for your domain's name servers.
Technically you only NEED one DNS server. Additional servers are only to conform to RFC spec and for failover purposes (ie: "Just in case").
The only part of the particular HowTo you linked that you should pay attention to in this case Step 5 and 8. Note: Step 8 will likely be different based on who your domain registrar is.