Clearer wording on Errata openzfs#4

Errata openzfs#4 doesn’t mention a non-destructive way to clear it. This commits fixes openzfs#8682

cmd/zpool/zpool_main.c

@@ -2574,10 +2574,12 @@ show_import(nvlist_t *config)
 				    "which needs\n\tto be corrected. Enable "
 				    "the bookmark_v2 feature, backup "
 				    "these datasets\n\tto new encrypted "
-				    "datasets, and destroy the old ones. "
-				    "If this pool does\n\tnot contain any "
-				    "encrypted datasets, simply enable the "
-				    "bookmark_v2\n\tfeature.\n"));
+				    "datasets, and destroy the old ones or "
+				    "create new snapshots and destroy all "
+				    "snapshots that were created before enabling "
+				    "bookmark_v2. If this pool does\n\tnot "
+				    "contain any encrypted datasets, simply enable "
+				    "the bookmark_v2\n\tfeature.\n"));
 				break;
 			default:
 				/*
@@ -7639,10 +7641,12 @@ status_callback(zpool_handle_t *zhp, void *data)
 			(void) printf(gettext("action: To correct the issue "
 			    "enable the bookmark_v2 feature, backup\n\tany "
 			    "existing encrypted datasets to new encrypted "
-			    "datasets,\n\tand destroy the old ones. If this "
-			    "pool does not contain any\n\tencrypted "
-			    "datasets, simply enable the bookmark_v2 "
-			    "feature.\n"));
+			    "datasets,\n\tand destroy the old ones or create "
+			    "new snapshots and destroy all snapshots that"
+			    "were created before enabling bookmark_v2. "
+			    "If this pool does\n\tnot contain any encrypted "
+			    "datasets, simply enable the "
+			    "bookmark_v2\n\tfeature.\n"));
 			break;
 
 		default: