Add keyword documentation in test suite

Change-Id: I9269319c51a3411813ffa3631c7b481bebbaad85
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_network.robot b/ipmi/test_ipmi_network.robot
index a174952..e96d584 100644
--- a/ipmi/test_ipmi_network.robot
+++ b/ipmi/test_ipmi_network.robot
@@ -252,6 +252,7 @@
 
 
 Create VLAN Via IPMI
+    [Documentation]  Create VLAN via inband IPMI command.
     [Arguments]  ${vlan_id}  ${channel_number}=${CHANNEL_NUMBER}
 
     # Description of argument(s):