text: Title: week 3 workbooks seed issue
  Body: Right now code in https://github.com/Yorko/mlcourse_open/blob/master/jupyter_notebooks/topic03_decision_trees_knn/topic3_trees_knn.ipynb `In[3]` is `np.seed = 7` but this seems to be typo and should be `np.random.seed(7)`?