Update documentation for Azure AD B2C (#145)

* Updates to match proposed changes to social-core

* Fix spacing

Author: zchoate

docs/backends/azuread.rst

@@ -91,12 +91,12 @@ To enable OAuth2 B2C Tenant support:
 - Fill in ``Client ID`` and ``Client Secret`` settings. These values can be
   obtained easily as described in `Azure AD Application Registration`_ doc::
 
-      SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_KEY = ''
-      SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_SECRET = ''
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_KEY = ''
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_SECRET = ''
 
 - Fill in the tenant id::
 
-      SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_TENANT_ID = ''
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_TENANT_NAME = ''
 
 - Fill in the B2C policy::
 
@@ -106,29 +106,28 @@ The policy should start with `b2c_`. For more information see `Azure AD B2C User
 
 - Also it's possible to define extra permissions with::
 
-      SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_RESOURCE = ''
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_RESOURCE = ''
 
   This is the resource you would like to access after authentication succeeds.
   Some of the possible values are: ``https://graph.windows.net`` or
   ``https://<your Sharepoint site name>-my.sharepoint.com``.
 
   When using Microsoft Graph, the resource needed is::
 
-      SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_RESOURCE = 'https://graph.microsoft.com/'
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_RESOURCE = 'https://graph.microsoft.com/'
 
 - Add the backend to the authentication backends setting::
 
       AUTHENTICATION_BACKENDS = (
           ...
-          'social_core.backends.azuread_tenant.AzureADB2COAuth2',
+          'social_core.backends.azuread_b2c.AzureADB2COAuth2',
           ...
       )
 
-- If you are using an authority host other than the default ``AZURE_PUBLIC_CLOUD`` ('login.microsoftonline.com')
-  then you can override the default with the  ``AUTHORITY_HOST`` setting. The Azure authority hosts are listed
-  in the `Azure Authority Hosts`_ doc::
+- If you are using an authority host other than the default ``AZURE_PUBLIC_CLOUD`` ('b2clogin.com')
+  then you can override the default with the  ``AUTHORITY_HOST`` setting.
 
-    SOCIAL_AUTH_AZUREAD_B2C_TENANT_OAUTH2_AUTHORITY_HOST = ''
+      SOCIAL_AUTH_AZUREAD_B2C_OAUTH2_AUTHORITY_HOST = ''
 
 .. _Azure AD Application Registration: https://docs.microsoft.com/en-us/azure/active-directory/develop/quickstart-register-app
 .. _Azure AD B2C User flows and custom policies overview: https://docs.microsoft.com/en-us/azure/active-directory-b2c/user-flow-overview