Incorrect path for user data resulting in FileNotFoundError

Hi:

I was going through the "amazon-personalize-samples/next_steps/workshops/Immersion_Day/personalize_hrnn_metadata_contextual_example.ipynb" and got a runtime error of "FileNotFoundError" because the file path was missing "airlines_data".

`#users_df = pd.read_csv('a_users.csv')
users_df = pd.read_csv('airlines_data/a_users.csv')
`

Open next_steps/workshops/Immersion_Day/personalize_hrnn_metadata_contextual_example.ipynb and inspect the users_df pandas read_csv path. Confirm the referenced a_users.csv location, update the path so the notebook runs without FileNotFoundError, and rerun the affected cell to verify it loads successfully.

Written by the indexing model from the issue text.