Fix MUSIC_DIRECTORY_SERVE_PATH example value in configuration.rst

docs/configuration.rst

@@ -112,7 +112,7 @@ in your :file:`docker-compose.yml` file::
       - /srv/funkwhale/data/music:/music:ro
 
 Then, the value of :ref:`setting-MUSIC_DIRECTORY_SERVE_PATH` should be
-``/srv/funkwhale/data``. This must be readable by the webserver.
+``/srv/funkwhale/data/music``. This must be readable by the webserver.
 
 On non-docker setup, you don't need to configure this setting.