message: Fix format error and add comments for playitem.
diff: @@ -19,14 +19,17 @@ pub mod user;
  use serde::{Deserialize, Serialize};
  -/// [track restriction object](https://developer.spotify.com/documentation/web-api/reference/object-model/#track-restriction-object)
  -/// [album restriction object](https://developer.spotify.com/documentation/web-api/reference/object-model/#album-restriction-object)
  +/// Restriction object
  +///
  +/// [Reference](https://developer.spotify.com/documentation/web-api/reference/object-model/#track-restriction-object)
  #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
  pub struct Restriction {
  pub reason: RestrictionReason,
  }
  -/// [Followers object](https://developer.spotify.com/documentation/web-api/reference/object-model/#followers-object)
  +/// Followers object
  +///
  +/// [Reference](https://developer.spotify.com/documentation/web-api/reference/object-model/#followers-object)
  #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
  pub struct Followers {
  // This field will always set to null, as the Web API does not support it at the moment.
  @@ -34,6 +37,10 @@ pub struct Followers {
  pub total: u32,
  }
  +/// A full track object or a full episode object
  +///
  +/// + [Reference to full track](https://developer.spotify.com/documentation/web-api/reference/object-model/#track-object-full)
  +/// + [Reference to full episode](https://developer.spotify.com/documentation/web-api/reference/object-model/#episode-object-full)
  #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
  #[serde(untagged)]
  pub enum PlayingItem {
  @@ -42,7 +49,7 @@ pub enum PlayingItem {
  }
  pub use {
  - album::*, artist::*, audio::*, category::*, context::*, device::*, enums::*,
  - image::*, offset::*, page::*, playing::*, playlist::*, recommend::*, search::*, show::*,
  - track::*, user::*,
  + album::*, artist::*, audio::*, category::*, context::*, device::*, enums::*, image::*,
  + offset::*, page::*, playing::*, playlist::*, recommend::*, search::*, show::*, track::*,
  + user::*,
  };
  