docs: update guidance on file formatting

CONTRIBUTING.md

@@ -105,6 +105,12 @@ The connector will check your npm authentication, generate a connection token, a
 
 ## Code style
 
+When committing changes, try to keep an eye out for unintended formatting updates. These can make a pull request look noisier than it really is and slow down the review process. Sometimes IDEs automatically reformat files on save, which can unintentionally introduce extra changes.
+
+To help with this, the project uses `oxfmt` to handle formatting via a pre-commit hook. The hook will automatically reformat files when needed. If something can’t be fixed automatically, it will let you know what needs to be updated before you can commit.
+
+If you want to get ahead of any formatting issues, you can also run `pnpm lint:fix` before committing to fix formatting across the whole project.
+
 ### Typescript
 
 - We care about good types – never cast things to `any` 💪