updated function name

`setId3Output` to `addMetadataOutput`

hello-world.md

@@ -131,7 +131,7 @@ onto which video is rendered, you can set the player's target `SurfaceView`,
 `setVideoSurfaceView`, `setVideoTextureView`, `setVideoSurfaceHolder` and
 `setVideoSurface` methods respectively. You can also use `PlayerControlView` as
 a standalone component, or implement your own playback controls that interact
-directly with the player. `SimpleExoPlayer`'s `setTextOutput` and `setId3Output`
+directly with the player. `SimpleExoPlayer`'s `setTextOutput` and `addMetadataOutput`
 methods can be used to receive caption and ID3 metadata during playback.
 
 ## Preparing the player ##