Fix list of supported cloud providers in CLI docs

cmd/kops/create_cluster.go

@@ -224,7 +224,6 @@ func NewCmdCreateCluster(f *util.Factory, out io.Writer) *cobra.Command {
 	var validClouds []string
 	{
 		allClouds := clouds.SupportedClouds()
-		var validClouds []string
 		for _, c := range allClouds {
 			validClouds = append(validClouds, string(c))
 		}

docs/cli/kops_create_cluster.md

@@ -73,7 +73,7 @@ kops create cluster [CLUSTER] [flags]
       --authorization string             Authorization mode: AlwaysAllow or RBAC (default "RBAC")
       --bastion                          Enable a bastion instance group. Only applies to private topology.
       --channel string                   Channel for default versions and configuration to use (default "stable")
-      --cloud string                     Cloud provider to use - 
+      --cloud string                     Cloud provider to use - aws, digitalocean, openstack
       --cloud-labels string              A list of key/value pairs used to tag all instance groups (for example "Owner=John Doe,Team=Some Team").
       --container-runtime string         Container runtime to use: containerd, docker
       --disable-subnet-tags              Disable automatic subnet tagging