[OIDC/Azure] OAuth2 must be disabled for OIDC

[IljaN]

WHAT Needs to be Documented?

Documentation for OIDC with Azure seems to be incorrect, OAuth2 must be disabled for OIDC.

WHERE Does This Need To Be Documented (Link)?

https://doc.owncloud.com/server/next/admin_manual/configuration/user/oidc/ms-azure-setup.html#use-oauth2-authentication-for-owncloud-desktop-and-mobile-clients

WHY Should This Change Be Made?

This is confusing customers as here we say that OAuth2 must be disabled for OIDC.

(Optional) What Type Of Content Change Is This?

• [ ] New Content Addition
• [ ] Old Content Deprecation
• [ ] Existing Content Simplification
• [x] Bug Fix to Existing Content

(Optional) Which Manual Does This Relate To?

• [x] Admin Manual
• [ ] Developer Manual
• [ ] User Manual
• [ ] Android
• [ ] iOS
• [ ] Branded Clients
• [ ] Desktop Client
• [ ] Other