Adding a command for mounting NFSv4.1

The UI for NFSv4.1 mount instructions has a bug, so we are adding the correct command in text.

Author: Julie Chen

articles/azure-netapp-files/azure-netapp-files-mount-unmount-volumes-for-virtual-machines.md

@@ -26,3 +26,6 @@ You can mount or unmount a volume for Windows or Linux virtual machines as neces
     ![Mount instructions NFS](../media/azure-netapp-files/azure-netapp-files-mount-instructions-nfs.png)
 
     ![Mount instructions SMB](../media/azure-netapp-files/azure-netapp-files-mount-instructions-smb.png)
+    
+If you are using NFSv4.1, use the following command to mount your file system: 
+`sudo mount -t nfs -o rw,hard,rsize=65536,wsize=65536,vers=4.1,tcp,sec=sys $MOUNTTARGETIPADDRESS:/$VOLUMENAME $MOUNTPOINT`