Improvement for documentation

[spechtx]

The documentation explains how to use TokenAuthentication:
https://www.django-rest-framework.org/api-guide/authentication/#tokenauthentication

In order to use TokenAuth, the settings.py file must define Default Authentication Classes:

   'DEFAULT_AUTHENTICATION_CLASSES': (
       'rest_framework.authentication.TokenAuthentication',
   ),

I have the information from here: https://stackoverflow.com/questions/26906630/django-rest-framework-authentication-credentials-were-not-provided

My suggestion / idea is, to add that information to the documentation.

Thank you :-)