Fix typo in error output.

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/f2f200910@292 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/bigtool/exception.py

@@ -97,7 +97,7 @@ class CmdMissParamSyntaxError(CmdSyntaxError):
         self.param = param
 
     def __str__(self):
-        return str("Parameter '%s' is missed for command '%s' of moudule '%s'" % 
+        return str("Parameter '%s' is missed for command '%s' of module '%s'" % 
                    (self.param, self.command, self.module))