Remove unneeded user action comment.

This is already taken care of by `AddToManagerFuncs`.

pkg/scaffold/controller/controller.go

@@ -143,7 +143,6 @@ import (
 
 // Add creates a new {{ .Resource.Kind }} Controller and adds it to the Manager with default RBAC. The Manager will set fields on the Controller
 // and Start it when the Manager is Started.
-// USER ACTION REQUIRED: update cmd/manager/main.go to call this {{ .Resource.Group}}.Add(mgr) to install this Controller
 func Add(mgr manager.Manager) error {
 	return add(mgr, newReconciler(mgr))
 }