Fix typo in GUC

src/backend/access/external/url.c

@@ -2495,7 +2495,7 @@ url_rewind(URL_FILE *file, const char *relname)
 			{
 				elog(ERROR, "Rescan is not supported for web external table: %s. "
 						"Please use 'set optimizer=on' as a work around "
-						"and 'set optimizer_enable_master_only=on' if accessing catalog tables.", relname);
+						"and 'set optimizer_enable_master_only_queries=on' if accessing catalog tables.", relname);
 			}
 			break;