Fix broken documentation link (#6400)

## Description

Closes #6392

## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [x] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [x] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [x] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

Co-authored-by: Sophie Dankel <47993817+sdankel@users.noreply.github.com>

sway-core/src/semantic_analysis/ast_node/expression/match_expression/analysis/usefulness.rs

@@ -20,7 +20,7 @@ use super::{
 /// http://moscova.inria.fr/%7Emaranget/papers/warn/warn004.html
 ///
 /// Implemented in Rust here:
-/// https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_build/thir/pattern/usefulness/index.html
+/// https://doc.rust-lang.org/1.75.0/nightly-rustc/rustc_mir_build/thir/pattern/usefulness/index.html
 ///
 /// ---
 ///