message: syntax/doc: fix enabld -> enabled
  PR
diff: @@ -198,7 +198,7 @@ pub fn escape_into(text: &str, buf: &mut String) {
  ///
  /// These are the only characters that are allowed to be escaped, with one
  /// exception: an ASCII space character may be escaped when extended mode (with
  -/// the `x` flag) is enabld. In particular, `is_meta_character(' ')` returns
  +/// the `x` flag) is enabled. In particular, `is_meta_character(' ')` returns
  /// `false`.
  ///
  /// Note that the set of characters for which this function returns `true` or
  