Convert RunCmd to an epydoc docstring

Reviewed-by: imsnah

lib/utils.py

@@ -108,10 +108,10 @@ def RunCmd(cmd):
   The command should not read from its standard input, as it will be
   closed.
 
-  Args:
-    cmd: command to run. (str)
-
-  Returns: `RunResult` instance
+  @param cmd: Command to run
+  @type  cmd: string or list
+  @return: `RunResult` instance
+  @rtype: RunResult
 
   """
   if no_fork: