anchor.diff:    ///
     /// The subtag values are _case sensitive_ and must be one of the valid
     /// subtags according to CLDR supplemental data:
  -  /// [language](http://unicode.org/cldr/latest/common/validity/language.xml),
  -  /// [region](http://unicode.org/cldr/latest/common/validity/region.xml). The
  +  /// [language](https://github.com/unicode-org/cldr/blob/master/common/validity/language.xml),
  +  /// [region](https://github.com/unicode-org/cldr/blob/master/common/validity/region.xml). The
     /// primary language subtag must be at least two and at most eight lowercase
     /// letters, but not four letters. The region region subtag must be two
     /// uppercase letters or three digits. See the [Unicode Language
  
positive.code:   ///
    /// The subtag values are _case sensitive_ and must be valid subtags according
    /// to CLDR supplemental data:
    /// [language](http://unicode.org/cldr/latest/common/validity/language.xml),
    /// [script](http://unicode.org/cldr/latest/common/validity/script.xml) and
    /// [region](http://unicode.org/cldr/latest/common/validity/region.xml) for
    /// each of languageCode, scriptCode and countryCode respectively.
    ///
    /// The [countryCode] subtag is optional. When there is no country subtag,
  
negative.code:   ///
    /// This must be a valid Unicode Language Identifier script subtag as listed
    /// in [Unicode CLDR supplemental
    /// data](https://github.com/unicode-org/cldr/blob/master/common/validity/script.xml).
    ///
    /// See also:
    ///
  