fix typo in server name

howto/postgresql.md

@@ -839,7 +839,7 @@ server to the database server and restores from those.
     find the WAL files. At least the `restore_command` need to be
     specified. Something like this should work:
 
-        restore_command = 'cp /var/lib/postgresql/restore/subnotablie/main.WAL.%f %p'
+        restore_command = 'cp /var/lib/postgresql/restore/subnotabile/main.WAL.%f %p'
 
     You can specify a specific recovery point in the `recovery.conf`,
     see the [upstream documentation](https://www.postgresql.org/docs/11/recovery-target-settings.html) for more information.