Typo fix: contraints -> constraints (kubernetes#8884)

mirake · k8s-ci-robot · commit 200857de807d · 2018-06-04T08:06:53.000-07:00
diff --git a/content/en/docs/getting-started-guides/ubuntu/operational-considerations.md b/content/en/docs/getting-started-guides/ubuntu/operational-considerations.md
@@ -25,7 +25,7 @@ The Juju Controller:
 To bootstrap a controller with constraints run the following command: 
 
 ```
-juju bootstrap --contraints "mem=8GB cpu-cores=4 root-disk=128G"
+juju bootstrap --constraints "mem=8GB cpu-cores=4 root-disk=128G"
 ```
 
 Juju will select the cheapest instance type matching your constraints on your target cloud. You can also use the ```instance-type``` constraint in conjunction with ```root-disk``` for strict control. For more information about the constraints available, refer to the [official documentation](https://jujucharms.com/docs/stable/reference-constraints)
