Fix command in docs, fixes #1499

docs/admin/migration.rst

@@ -95,8 +95,8 @@ Restore the database dump:
 
 .. code-block:: shell
 
-    docker exec -i funkwhale_postgres_1 pg_restore -c -U postgres -d postgres < "db.dump"
+    docker exec -i funkwhale_postgres_1 psql -U postgres -d postgres < db.dump
 
 Once the database has been restored, run the migrations following the docker installation guide. 
 
-Ensure that all DNS changes have been made and start the services.
+Ensure that all DNS changes have been made and start the services.