Add automatic offline update pre condition

Signed-off-by: Sudarshan C Psudarshan.cp2@in.bosch.com

content/guides/ostree.md

@@ -71,7 +71,7 @@ to use it for the system upgrade.
 
 {{% notice info %}}
 Automatic offline update will be triggered only in case of USB drive should have single partition
-and renamed the delta file as mentioned above.
+and the delta file is renamed as mentioned above.
 Step to check and create partition table on Apertis SDK.
 	$lsblk
     $sudo fdisk /dev/<drive in which usb is mounted e.g /dev/sdb>