fix: Simplify PropagationPolicy comment as suggested in review

Co-authored-by: circy9 <13264318+circy9@users.noreply.github.com>

Author: Copilot

apis/cluster/v1beta1/zz_generated.deepcopy.go

@@ -1326,7 +1326,6 @@ const (
 // DeleteStrategy configures the deletion behavior when a placement is deleted.
 type DeleteStrategy struct {
 	// PropagationPolicy controls whether to delete placed resources when the placement is deleted.
-	// Defaults to "Delete".
 	//
 	// Available options:
 	//