Fix deprecated reference to Player.EventListener in the dev guide

#minor-release

PiperOrigin-RevId: 417961565

docs/retrieving-metadata.md

@@ -6,7 +6,7 @@ title: Retrieving metadata
 
 The metadata of the media can be retrieved during playback in multiple ways. The
 most straightforward is to listen for the
-`Player.EventListener#onMediaMetadataChanged` event; this will provide a
+`Player.Listener#onMediaMetadataChanged` event; this will provide a
 [`MediaMetadata`][] object for use, which has fields such as `title` and
 `albumArtist`. Alternatively, calling `Player#getMediaMetadata` returns the same
 object.