message: Fix rustdoc.
diff: @@ -712,7 +712,7 @@ impl BlockHeader {
  self.accumulated_seed
  }
  - /// Returns the [`EraEnd`] of a block if it is a switch block.
  + /// Returns the `EraEnd` of a block if it is a switch block.
  pub fn era_end(&self) -> Option<&EraEnd> {
  self.era_end.as_ref()
  }
  