Upgrade to v6 docs?

Good day team,

Since there is nothing new in the [docs](https://github.com/microsoftgraph/msgraph-sdk-dotnet/tree/main/docs), I was wondering if there are any other significant changes in the v6 versions and especially the update of microsoft-graph-core to 4.x, besides those that are in the [release notes](https://github.com/microsoftgraph/msgraph-sdk-dotnet/compare/5.105.0...6.0.0)