Update build command in test instructions for runtime repo
Update build command in test instructions for runtime repo

Specify `AutoGenerateAssemblyVersion=false` for building to test against `dotnet/runtime`
dotnet/roslyn-analyzers,mavasani/roslyn-analyzers,pakdev/roslyn-analyzers,mavasani/roslyn-analyzers,dotnet/roslyn-analyzers,pakdev/roslyn-analyzers