Correct device_type in Cumulus NVUE comment

Change-Id: I8904604b333bf3d734b0fe813685ed8b5643e127

Author: MoteHue

networking_generic_switch/devices/netmiko_devices/cumulus.py

@@ -96,7 +96,7 @@ class CumulusNVUE(netmiko_devices.NetmikoSwitch):
     where secret is the password needed for sudo su:
 
     [genericswitch:<hostname>]
-    device_type = netmiko_cumulus
+    device_type = netmiko_cumulus_nvue
     ip = <ip>
     username = <username>
     password = <password>