Update to doc generating project
Update to doc generating project

Neo4j.Driver.Docs.shfbproj file updated so that the FrameWorkVersion references .Net Framework 4.8. The previous .NET Portable Library seems to have been a work around of some kind from 4 years ago. This change is needed to get the docs building on the new 2019 build agents that don't have the 'hack' on them. We will investigate a more robust documentation strategy going forward.
neo4j/neo4j-dotnet-driver,neo4j/neo4j-dotnet-driver