postgres superuser note (#227)

* postgres superuser note

Author: vankovap

apps/docs/content/postgresql/how-to/manage.mdx

@@ -114,14 +114,18 @@ You can list all available PostgreSQL plugins by running the following query *(s
 SELECT * FROM pg_available_extensions ORDER BY name;
 ```
 
-To install plugins, you must **connect as a superuser** (`postgres`) and run the appropriate CREATE EXTENSION command. For example:
+To install plugins, you must **connect as a superuser** (see note below) and run the appropriate CREATE EXTENSION command. For example:
 
 ```sql
 CREATE EXTENSION pg_stat_statements;
 CREATE EXTENSION vector;
 CREATE EXTENSION postgis;
 ```
 
+:::info Superuser Credentials
+The PostgreSQL superuser credentials can be found in the `superUser` and `superUserPassword` environment variables of your PostgreSQL service.
+:::
+
 :::warning
 Currently, it is not possible to add new plugins that are not already listed in `pg_available_extensions`.
 :::
@@ -170,4 +174,4 @@ unaccent.rules
 ```
 </DropdownItem>
 </Dropdown>
-For more information on text search dictionaries, refer to the [PostgreSQL documentation](https://www.postgresql.org/docs/16/textsearch-dictionaries.html).
+For more information on text search dictionaries, refer to the [PostgreSQL documentation](https://www.postgresql.org/docs/16/textsearch-dictionaries.html).