Update user guide on manual tests

Update the user guide to reflect the correct flags needed
for the manual tests.

Change-Id: I5459e06f26f25e0f269c75adce1ec3a23f64e809
Signed-off-by: Joel Hutton <Joel.Hutton@Arm.com>
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 5bfab79..bee883d 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -459,9 +459,13 @@
 flag must be used to write the NVM to a file when the model exits.
 
 ::
-
         -C bp.flashloader0.fnameWrite=[filename]
 
+To ensure the model exits on shutdown the following flag must be used:
+
+::
+        -C bp.ve_sysregs.exit_on_shutdown=1
+
 After the model has been shutdown, this file must be fed back in to continue
 the test. Note this flash file includes the FIP image, so the original fip.bin
 does not need to be passed in. The following flag is used: