Five `@official@` links in the Angular roadmap point at angular.dev paths
that no longer exist. They are easy to miss because angular.dev is an SPA
that serves its app shell (HTTP 200) for every path, so a link checker
sees them as healthy while a reader gets the 404 page.
- Transitions & Triggers: the guide moved to /guide/legacy-animations/,
the old URL matched the content file name rather than the route.
- Feature Modules / Creating Modules: /guide/ngmodules/feature-modules
was removed, point both at the NgModules overview instead. The
#how-to-make-a-feature-module anchor has no equivalent, so it is dropped.
- Pipes Precedence and Custom Pipes: pipe guides live under
/guide/templates/pipes now, deep linked to the relevant sections.
Targets verified against the route table and content in angular/angular@main.
