Corrected execution command for code update

Change-Id: I53277b2c7722d08af65ab39e0283f60a6afc333c
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/extended/code_update/ipmi_bmc_code_update.robot b/extended/code_update/ipmi_bmc_code_update.robot
index 7fe7c9f..bf0028a 100644
--- a/extended/code_update/ipmi_bmc_code_update.robot
+++ b/extended/code_update/ipmi_bmc_code_update.robot
@@ -1,8 +1,9 @@
 *** Settings ***
 Documentation     Test BMC code update on a target BMC.
 ...               Execution Command:
-...               python -m robot -v OPENBMC_HOST:<hostname>
-...               -v IMAGE_FILE_PATH:<path/*.tar>  bmc_code_update.robot
+...               python -m robot -v OPENBMC_HOST:<hostname> -v OS_HOST:<OS IP>
+...               -v OS_USERNAME:<OS username> -v OS_PASSWORD:<OS password>
+...               -v IMAGE_FILE_PATH:<path/*.tar> ipmi_bmc_code_update.robot
 
 Resource          ../../lib/code_update_utils.robot
 Resource          ../../lib/ipmi_client.robot