Update resources info of USB partition for usb-unplug test

Signed-off-by: Sudarshan C P <sudarshan.cp2@in.bosch.com>

test-cases/apertis-update-manager-usb-unplug.yaml

@@ -13,7 +13,8 @@ metadata:
 
   resources:
     - "A static encrypted update bundle file of the same architecture, variant and version as the testing image"
-    - "A Fat32 USB flash drive, preloaded with the encrypted update bundle at the root of the disk"
+    - "A Fat32 USB flash drive, with only one partition."
+    - "Preload the encrypted update bundle at the root of the disk"
     - "The latest static encrypted update file can be downloaded at the same location than the Apertis image. It has the same basename, and a '.delta.enc' extension"
     - "The static encrypted update file should be copied to the flash drive using the name 'static-update.bundle.enc'."
     - "A PC must be connected to DUT serial port"