Fix hyperlink at the bottom of CONTRIBUTING.md (#3392)

docs/CONTRIBUTING.md

@@ -30,15 +30,16 @@ inside the project. We use [xtask][xtask] as an ad-hoc task runner and
 thus do not require any dependencies other than `cargo` (You don't have
 to `cargo install` anything either).
 
-[good-first-issue]: https://github.com/helix-editor/helix/labels/E-easy
-[log-file]: https://github.com/helix-editor/helix/wiki/FAQ#access-the-log-file
-[architecture.md]: ./architecture.md
-[docs]: https://docs.helix-editor.com/
-[xtask]: https://github.com/matklad/cargo-xtask
-
 # Integration tests
 
 Integration tests for helix-term can be run with `cargo integration-test`. Code
 contributors are strongly encouraged to write integration tests for their code.
 Existing tests can be used as examples. Helpers can be found in
-[helpers.rs][../helix-term/tests/test/helpers.rs].
+[helpers.rs][helpers.rs]
+
+[good-first-issue]: https://github.com/helix-editor/helix/labels/E-easy
+[log-file]: https://github.com/helix-editor/helix/wiki/FAQ#access-the-log-file
+[architecture.md]: ./architecture.md
+[docs]: https://docs.helix-editor.com/
+[xtask]: https://github.com/matklad/cargo-xtask
+[helpers.rs]: ../helix-term/tests/test/helpers.rs