DOCSP-33640: link to new rust docs (#139)

Author: rustagir

source/index.txt

@@ -151,7 +151,7 @@ MongoDB Documentation
 
    .. card::
       :headline: Rust
-      :url: https://www.mongodb.com/docs/drivers/rust/
+      :url: https://www.mongodb.com/docs/drivers/rust/current/
       :icon: /images/icons/rust.svg
       :icon-alt: Rust Driver icon