cmd: adds all possible types (--type arg) when showing the help message from the "new" subcommand (#895)

This way the user is aware all available operator types when running `operator-sdk new --help`

Author: odra

commands/operator-sdk/cmd/new.go

@@ -51,7 +51,7 @@ generates a skeletal app-operator application in $GOPATH/src/github.com/example.
 
 	newCmd.Flags().StringVar(&apiVersion, "api-version", "", "Kubernetes apiVersion and has a format of $GROUP_NAME/$VERSION (e.g app.example.com/v1alpha1)")
 	newCmd.Flags().StringVar(&kind, "kind", "", "Kubernetes CustomResourceDefintion kind. (e.g AppService)")
-	newCmd.Flags().StringVar(&operatorType, "type", "go", "Type of operator to initialize (e.g \"ansible\")")
+	newCmd.Flags().StringVar(&operatorType, "type", "go", "Type of operator to initialize (choices: \"go\", \"ansible\" or \"helm\")")
 	newCmd.Flags().BoolVar(&skipGit, "skip-git-init", false, "Do not init the directory as a git repository")
 	newCmd.Flags().BoolVar(&generatePlaybook, "generate-playbook", false, "Generate a playbook skeleton. (Only used for --type ansible)")
 	newCmd.Flags().BoolVar(&isClusterScoped, "cluster-scoped", false, "Generate cluster-scoped resources instead of namespace-scoped")