fix broken link

Author: noam-stein

src/rust-binding/calling-gdscript.md

@@ -54,7 +54,7 @@ Now, it's not possible to directly return `Enemy` instances in exported methods,
 #[export]
 fn create_enemy(&mut self, _owner: &Node) -> Enemy {...}
 ```
-Instead, you can wrap the object in a `Instance<Enemy, Unique>`, using `emplace()`. For an in-depth explanation of the `Instance` class, read [this section](http://localhost:3000/gdnative-overview/wrappers.html#instance-reference-with-attached-rust-class).
+Instead, you can wrap the object in a `Instance<Enemy, Unique>`, using `emplace()`. For an in-depth explanation of the `Instance` class, read [this section](https://godot-rust.github.io/book/gdnative-overview/wrappers.html#instance-reference-with-attached-rust-class).
 ```rust
 #[export]
 fn create_enemy(