message: age: Don't document macros that are only for internal use
diff: @@ -16,6 +16,7 @@ lazy_static! {
  }
  /// Loads a localized age string.
  +#[doc(hidden)]
  #[macro_export]
  macro_rules! fl {
  ($message_id:literal) => {{
  @@ -24,6 +25,7 @@ macro_rules! fl {
  }
  /// age-localized version of the write! macro.
  +#[doc(hidden)]
  #[macro_export]
  macro_rules! wfl {
  ($f:ident, $message_id:literal) => {
  @@ -32,6 +34,7 @@ macro_rules! wfl {
  }
  /// age-localized version of the writeln! macro.
  +#[doc(hidden)]
  #[macro_export]
  macro_rules! wlnfl {
  ($f:ident, $message_id:literal) => {
  