Improve openbmctool_execute_command documentation

Change-Id: I56ed1897288bf549bd5b288b9a10b4b7d6d084a1
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/openbmctool_utils.py b/lib/openbmctool_utils.py
index a34436b..eb6aacd 100755
--- a/lib/openbmctool_utils.py
+++ b/lib/openbmctool_utils.py
@@ -44,8 +44,11 @@
     Description of arguments:
     command_string                  The command string to be passed to the
                                     openbmctool.py program.
-    args/kwargs     These are passed directly to shell_cmd.  See the shell_cmd
-    prolog for details.
+    All remaining arguments are passed directly to shell_cmd.  See the
+    shell_cmd prolog for details on allowable arguments.  The caller may code
+    them directly as in this example:
+    openbmctool_execute_command("my command", quiet=1, max_attempts=2).
+    Python will do the work of putting these values into args/kwargs.
     """
 
     if not gv.valid_value(command_string):