Dex Microsoft connector documentation outdated

Based on https://github.com/dexidp/dex/pull/4046, you have changed the required Microsoft delegations from Directory.Read.All to GroupMember.Read.All. Yet the [documentation](https://dexidp.io/docs/connectors/microsoft/#caveats) does not reflect that. Please add the correct app registration requirements to implement group-based Microsoft Entra login correctly! Thank you!