Update contributor-book/src/getting-started/testing.md

Co-authored-by: Sylvain Benner <[email protected]>

contributor-book/src/getting-started/testing.md

@@ -14,6 +14,6 @@ Test for autodiff go under [burn-autodiff/src/tests/{op_name}.rs](https://github
 
 1. use small tensors with simple values
 2. pop open a terminal, launch `ipython` and import `numpy` then do the calculations by hand. You can also use [google colab](https://colab.google/) if you prefer so that you don't have to install the packages on your system.
-3. comparing the actual to expected output for lhs, rhs and regular operation
+3. compare the actual output to the expected output for lhs, rhs and regular operation
 
 generally, it seems preferable to use `actual_output_tensor.into_data().assert_approx_eq(&expected_tensor_data,3)` to `assert_eq!(...` due to occasional hiccups with floating point calculations.