Fix postgres maintenance links

CHANGELOG.md

@@ -19,9 +19,9 @@ To try out conduwuit, we recommend that you **use a new server**. Refer to our [
 
 The Synapse homeserver [requires Postgres v13 or newer](https://github.com/element-hq/synapse/issues/18034).
 
-If you've been maintaining your setup for a while and you haven't been doing [Postgres upgrades](maintenance-postgres.md#upgrading-postgresql), you may be on an old version of Postgres. The easiest way to check is to see the contents of the `/matrix/postgres/data/PG_VERSION` file.
+If you've been maintaining your setup for a while and you haven't been doing [Postgres upgrades](docs/maintenance-postgres.md#upgrading-postgresql), you may be on an old version of Postgres. The easiest way to check is to see the contents of the `/matrix/postgres/data/PG_VERSION` file.
 
-If you're on a Postgres version older than v13, you need to [upgrade your Postgres setup](maintenance-postgres.md#upgrading-postgresql) or Synapse will produce an error on startup.
+If you're on a Postgres version older than v13, you need to [upgrade your Postgres setup](docs/maintenance-postgres.md#upgrading-postgresql) or Synapse will produce an error on startup.
 
 If you're using an external Postgres server (not installed by this playbook), you'll need to figure out how to upgrade it yourself.