Use better fake db name

Author: jbranchaud

postgres/terminating-a-connection.md

@@ -29,7 +29,7 @@ following:
 ```sql
 select pg_terminate_backend(pg_stat_activity.pid)
 from pg_stat_activity
-where pg_stat_activity.datname = 'test_drop'
+where pg_stat_activity.datname = 'sample_db'
   and pid <> pg_backend_pid();
  pg_terminate_backend
 ----------------------