Fix some word spellings

Change-Id: Id6369862fc0e0562cb1eff712f54d7ea8a6a70c6
diff --git a/scenario/test_autoscaling_lb.py b/scenario/test_autoscaling_lb.py
index bba55e1..080f17f 100644
--- a/scenario/test_autoscaling_lb.py
+++ b/scenario/test_autoscaling_lb.py
@@ -39,7 +39,7 @@
         for count in range(retries):
             time.sleep(1)
             r = requests.get(url)
-            # skip unsuccessfull requests
+            # skip unsuccessful requests
             if r.status_code == 200:
                 resp.add(r.text)
         self.assertEqual(expected_num, len(resp))