Update migrations/tests/extensions/11-wal2json.sql

Co-authored-by: Bobbie Soedirgo <[email protected]>

Author: darora

migrations/tests/extensions/11-wal2json.sql

@@ -1,5 +1,6 @@
 BEGIN;
 select pg_drop_replication_slot(slot_name) from pg_replication_slots where slot_name = 'test_slot';
 select * from pg_create_logical_replication_slot('test_slot', 'wal2json');
+-- a rollback of the txn does not remove the logical replication slot that gets created, so we need to manually drop it
 select pg_drop_replication_slot(slot_name) from pg_replication_slots where slot_name = 'test_slot';
 ROLLBACK;