fix some invalid link in user_manual.md

Author: slanterns

src/vision/shiny_future/users_manual.md

@@ -342,15 +342,15 @@ One other thing to be aware of is that async drop will trigger implicit awaits e
 [deliv_cancellation]: ../roadmap/borrowed_data_and_cancellation.md
 [deliv_borrowed_data]: ../roadmap/borrowed_data_and_cancellation.md
 [deliv_async_read_write]: ../../design_docs/async_read_write.md
-[deliv_impl_trait_in_trait]: https://rust-lang.github.io/async-fundamentals-initiative/design-discussions/impl_trait_in_traits.html
+[deliv_impl_trait_in_trait]: https://rust-lang.github.io/async-fundamentals-initiative/roadmap/impl_trait_in_traits.html
 [deliv_gats]: https://github.com/rust-lang/generic-associated-types-initiative
 [deliv_tait]: https://github.com/rust-lang/rust/issues/63063
-[deliv_dyn_async_trait]: https://rust-lang.github.io/async-fundamentals-initiative/design-discussions/dyn_async_trait.html
-[deliv_dyn_trait]: https://rust-lang.github.io/async-fundamentals-initiative/design-discussions/dyn_trait.html
+[deliv_dyn_async_trait]: https://rust-lang.github.io/async-fundamentals-initiative/roadmap/dyn_async_trait.html
+[deliv_dyn_trait]: https://rust-lang.github.io/async-fundamentals-initiative/roadmap/dyn_trait.html
 [deliv_scope_api]: ../roadmap/scopes/scope_api.md
 [deliv_inline_async_fn]: ../roadmap/async_fn/inline_async_fn.md
-[deliv_async_drop]: https://rust-lang.github.io/async-fundamentals-initiative/design-discussions/async_drop.html
+[deliv_async_drop]: https://rust-lang.github.io/async-fundamentals-initiative/roadmap/async_drop.html
 [deliv_async_fundamentals]: https://rust-lang.github.io/async-fundamentals-initiative/
-[deliv_async_overloading]: ../roadmap/async_fn/deliv_async_overloading.md
+[deliv_async_overloading]: ../roadmap/async_overloading.md
 [deliv_tooling]: ../roadmap/tooling.md
 [deliv_boxable]: ../roadmap/async_fn/boxable.md