docs: update tutorial.md
fix default namespace description for ctrl.NewManager.
@@ -66,7 +66,7 @@ The Manager can restrict the namespace that all controllers will watch for resou
mgr, err := ctrl.NewManager(cfg, manager.Options{Namespace: namespace})
```
-By default this will be the namespace that the operator is running in. To watch all namespaces leave the namespace option empty:
+By default this will be empty string which means watch all namespaces:
```Go
mgr, err := ctrl.NewManager(cfg, manager.Options{Namespace: ""})
