Fix link to module

api/client-server/room_upgrades.yaml

@@ -32,8 +32,8 @@ paths:
       summary: Upgrades a room to a new room version.
       description: |-
         Upgrades the given room to a particular room version, migrating as much
-        data as possible over to the new room. See the `room_upgrades`_ module
+        data as possible over to the new room. See the `room_upgrades <#room-upgrades>`_
-        for more information on what this entails.
+        module for more information on what this entails.
       operationId: upgradeRoom
       security:
         - accessToken: []