message: docs(common): fix CLDR website link in FormStyle doc
  The `FormStyle` enum offers two options, and the explanation of the difference between the two can be found on the CLDR official website. Sadly, the link changed and the one currently referenced is a dead-end. This commit fixes the link.
  PR Close
diff: @@ -47,7 +47,7 @@ export enum Plural {
  * Context-dependant translation forms for strings.
  * Typically the standalone version is for the nominative form of the word,
  * and the format version is used for the genitive case.
  - * @see [CLDR website](http://cldr.unicode.org/translation/date-time#TOC-Stand-Alone-vs.-Format-Styles)
  + * @see [CLDR website](http://cldr.unicode.org/translation/date-time-1/date-time#TOC-Standalone-vs.-Format-Styles)
  * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n)
  *
  * @publicApi
  