[IDEA] Result Readability - 02_end_to_end_machine_learning_project.ipynb

To improve the readability of which parameter is more efficient in cv_results, I suggest a small adaptation in the code:

Notebook: [02_end_to_end_machine_learning_project](https://github.com/ageron/handson-ml2/blob/master/02_end_to_end_machine_learning_project.ipynb)

### In cell 105
From:

```
cvres = rnd_search.cv_results_
for mean_score, params in zip(cvres["mean_test_score"], cvres["params"]):
print(np.sqrt(-mean_score), params)
```

To:

```
cvres = rnd_search.cv_results_
for rank, mean_score, params in zip(cvres['rank_test_score'], cvres['mean_test_score'], cvres['params']):
print(rank, np.sqrt(-mean_score), params)
```