message: Add doc comment to Addr::as_bytes
diff: @@ -53,6 +53,9 @@ impl Addr {
  self.0.as_str()
  }
  + /// Returns the UTF-8 encoded address string as a byte array.
  + ///
  + /// This is equivalent to `address.as_str().as_bytes()`.
  #[inline]
  pub fn as_bytes(&self) -> &[u8] {
  self.0.as_bytes()
  