update_engine: update help text

Fixing typo enable -> disable

Test: th
Change-Id: I2964c8b81705165ec933804da9bd5ea7483a1bb0
diff --git a/scripts/update_device.py b/scripts/update_device.py
index 26e6e1c..e8725c4 100755
--- a/scripts/update_device.py
+++ b/scripts/update_device.py
@@ -409,7 +409,7 @@
   parser.add_argument('--enable-threading', action='store_true',
                       help='Enable multi-threaded compression for VABC')
   parser.add_argument('--disable-threading', action='store_true',
-                      help='Enable multi-threaded compression for VABC')
+                      help='Disable multi-threaded compression for VABC')
   parser.add_argument('--batched-writes', action='store_true',
                       help='Enable batched writes for VABC')
   parser.add_argument('--speed-limit', type=str,