Add workaround for the HttpBody issue into the FAQ
Add workaround for the HttpBody issue into the FAQ

Duikmeester/google-api-dotnet-client,googleapis/google-api-dotnet-client,googleapis/google-api-dotnet-client,Duikmeester/google-api-dotnet-client,Duikmeester/google-api-dotnet-client,jskeet/google-api-dotnet-client,jskeet/google-api-dotnet-client,Duikmeester/google-api-dotnet-client,googleapis/google-api-dotnet-client,jskeet/google-api-dotnet-client