needless repetition

Author: tshepang

src/conventions.md

@@ -43,7 +43,7 @@ environment.
 ### Formatting and linting Python code
 
 The Rust repository contains quite a lot of Python code. We try to keep
-it both linted and formatted by the [ruff][ruff] tool.
+it both linted and formatted by the [ruff] tool.
 
 When modifying Python code, use this command to format it:
 ```console