Fix node hostname in glusterfs inventory.example

Remove duplicate hostname usage.

contrib/network-storage/glusterfs/inventory.example

@@ -12,7 +12,7 @@
 # ## As in the previous case, you can set ip to give direct communication on internal IPs
 # gfs_node1 ansible_ssh_host=95.54.0.18 # disk_volume_device_1=/dev/vdc  ip=10.3.0.7
 # gfs_node2 ansible_ssh_host=95.54.0.19 # disk_volume_device_1=/dev/vdc  ip=10.3.0.8 
-# gfs_node1 ansible_ssh_host=95.54.0.20 # disk_volume_device_1=/dev/vdc  ip=10.3.0.9 
+# gfs_node3 ansible_ssh_host=95.54.0.20 # disk_volume_device_1=/dev/vdc  ip=10.3.0.9 
 
 # [kube-master]
 # node1