message: docs: make MDN link locale-indepenent
  `en-US` makes it link to the English (US) version.
  This patch removes this and let's MDN auto-redirect to the user's preferred/selected language/website locale.
  PR Close
diff: @@ -68,7 +68,7 @@ The generated `src/app/highlight.directive.ts` is as follows:
  The imported `Directive` symbol provides Angular the `@Directive` decorator.
  The `@Directive` decorator's lone configuration property specifies the directive's
  -[CSS attribute selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors), `[appHighlight]`.
  +[CSS attribute selector](https://developer.mozilla.org/docs/Web/CSS/Attribute_selectors), `[appHighlight]`.
  It's the brackets (`[]`) that make it an attribute selector.
  Angular locates each element in the template that has an attribute named `appHighlight` and applies the logic of this directive to that element.
  