use correct interface for internal network (team#40971)

howto/ganeti.md

@@ -2665,7 +2665,7 @@ This procedure replaces the `gnt-node add` step in the initial setup
 of the first Ganeti node when the `gnt-chi` cluster was setup:
 
     gnt-cluster init \
-        --master-netdev eth2 \
+        --master-netdev eth1 \
         --nic-parameters link=br0 \
         --vg-name vg_ganeti \
         --secondary-ip 172.30.131.101 \