Fix links from the tutorial to the Rust crates

The crate has been renamed. There's a redirect in place, so the release docs should be ok,
but in the future we should use the right name.

docs/tutorial/rust/src/game_logic_in_rust.md

@@ -34,7 +34,7 @@ Insert this code before the `main_window.run()` call:
 {{#include main_game_logic_in_rust.rs:game_logic}}
 ```
 
-Notice that we take a [Weak](https://slint-ui.com/docs/rust/sixtyfps/struct.weak) pointer of our `main_window`. This is very
+Notice that we take a [Weak](https://slint-ui.com/docs/rust/slint/struct.weak) pointer of our `main_window`. This is very
 important because capturing a copy of the `main_window` itself within the callback handler would result in a circular ownership.
 The `MainWindow` owns the callback handler, which itself owns a reference to the `MainWindow`, which must be weak
 instead of strong to avoid a memory leak.