docs: add example for usage of the main listenbrainz instance (#71)

* docs: add example for usage of the main listenbrainz instance

* Update scrobbler.md

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Co-authored-by: Gabe Farrell <90876006+gabehf@users.noreply.github.com>

docs/src/content/docs/guides/scrobbler.md

@@ -32,4 +32,5 @@ Once the relay is configured, Koito will automatically forward any requests it r
 
 :::note
 Be sure to include the full path to the ListenBrainz endpoint of the server you are relaying to in the `KOITO_LBZ_RELAY_URL`.
+For example, to relay to the main ListenBrainz instance, you would set `KOITO_ENABLE_LBZ_RELAY` to `https://api.listenbrainz.org/1`.
 :::