fix(docs): Fix postgres upgrade instructions

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2669>

docs/administrator/migration.md

@@ -126,6 +126,6 @@ Check the file and remove any duplicated settings after copying.
 
 Once you have imported your database and run migrations, you can start all containers.
 
-```{code-block} sh
-sudo docker compose up -d
+```console
+# docker compose up -d
 ```

docs/administrator/upgrade/docker.md

@@ -136,8 +136,8 @@ To update your Postgres container, follow these steps:
 Once you've updated your Postgres containers, you need to migrate your database. To do this:
 
 :::{include} /administrator/migration.md
-:start-line: 112
-:end-line: 129
+:start-line: 105
+:end-line: 132
 :::
 
 :::{seealso}