message: Remove superfluous `#[from]` attribute from `SyncFinished` and add relevant comment
diff: @@ -96,7 +96,7 @@ pub(crate) enum Event<P> {
  #[from]
  ContractRuntimeAnnouncement(ContractRuntimeAnnouncement),
  - #[from]
  + /// The chain synchronization process has finished.
  SyncFinished,
  }
  