Update documentation

[samwelkanda]

Where did you get the code?

Followed the tutorial from Microsoft Graph tutorials

Describe the bug

There is a typo in the documentation that refers to a non-existent function, get_sign_in_url leading to unnecessary ImportError.

from tutorial.auth_helper import get_sign_in_url, get_token_from_code, store_user, remove_user_and_token, get_token

To Reproduce

Steps to reproduce the behavior:

1. Go to 'Python tutorial main page'
2. Click on 'Step 3: Add Azure AD authentication'
3. Scroll down to 'Step 5 under Get user details'
4. See typo

Expected behavior

from tutorial.auth_helper import get_sign_in_flow, get_token_from_code, store_user, remove_user_and_token, get_token

Screenshots

[jasonjoh]

Thanks for reporting. This has been fixed (see #46) but hasn't been published to the live site yet.