message: Update PlaylistSound for v9
  Closes
diff: @@ -4,7 +4,7 @@ import type { DocumentModificationOptions } from '../../common/abstract/document
  declare global {
  /**
  * The client-side PlaylistSound document which extends the common BasePlaylistSound model.
  - * Each PlaylistSound belongs to the sounds collection of a Playlist entity.
  + * Each PlaylistSound belongs to the sounds collection of a Playlist document.
  * Each PlaylistSound contains a PlaylistSoundData object which provides its source data.
  *
  * @see {@link foundry.data.PlaylistSoundData} The PlaylistSound data schema
  