docs(docs): modify the wrong content in contributing md

Author: Xiao75896453

docs/contributing.md

@@ -22,7 +22,7 @@ If you're a first-time contributor, you can check the issues with [good first is
    (We use [CodeCov](https://codecov.io/) to ensure our test coverage does not drop.)
 7. Use [commitizen](https://github.com/commitizen-tools/commitizen) to do git commit. We follow [conventional commits][conventional-commits]
 8. Run `./scripts/format` and `./scripts/test` to ensure you follow the coding style and the tests pass.
-9. Optionally, update the `README.md`.
+9. Optionally, update the `./docs/README.md`.
 9. **Do not** update the `CHANGELOG.md`, it will be automatically created after merging to `master`.
 10. **Do not** update the versions in the project, they will be automatically updated.
 10. If your changes are about documentation. Run `poetry run mkdocs serve` to serve documentation locally and check whether there is any warning or error.