fixup! clarify TimeAdded

Author: pohly

keps/sig-scheduling/5055-dra-device-taints-and-tolerations/README.md

@@ -292,7 +292,8 @@ type DeviceTaint struct {
     // It might get added as part of that.
 
     // TimeAdded represents the time at which the taint was added.
-    // It is only written for NoExecute taints.
+    // For NoExecute taints, the current time is set automatically
+    // when adding such a taint. There is no default for other taints.
     //
     // +optional
     TimeAdded *metav1.Time