remove cruft from my last commit

...i need more coffee

advocacy_docs/supported-open-source/barman/single-server-streaming/step01-db-setup.mdx

@@ -114,7 +114,7 @@ psql -d pagila
 
 The relevant configuration parameter is [`listen_addresses`](https://www.postgresql.org/docs/current/runtime-config-connection.html#GUC-LISTEN-ADDRESSES):
 
-```shell
+```sql
 show listen_addresses;
 __OUTPUT__
  listen_addresses 
@@ -125,8 +125,8 @@ __OUTPUT__
 
 The value for this server is `*` - which allows connections from anything. This doesn't need to be changed. If the value were to be empty, `localhost`, or a list of hosts or addresses that don't include our database server, we'd need to add its hostname (`backup`) to the list, or change it to the wildcard. 
 
-```shell
-pagila=# ALTER SYSTEM SET listen_addresses TO "*";
+```sql
+ALTER SYSTEM SET listen_addresses TO "*";
 __OUTPUT__
 ALTER SYSTEM
 ```