informers: add comment that Start does not block

Signed-off-by: Dr. Stefan Schimanski <[email protected]>

Author: Jefftree

staging/src/k8s.io/apiextensions-apiserver/examples/client-go/pkg/client/informers/externalversions/factory.go

@@ -300,7 +300,7 @@ type SharedInformerFactory interface {
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
 	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
-        Start(stopCh <-chan struct{})
+	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
 	// informers can be started anymore and Start will return without