Updated RabbitHutch outdated method comments.

EasyNetQ.CreateBus(string connectionString) and EasyNetQ.CreateBus(string connectionString, Action<IServiceRegister> registerServices) were mentioning that, if not specified, the default
requestedHeartbeat would be 0. This is incorrect, the default value is set in EasyNetQ.ConnectionConfiguration ctor “RequestedHeartbeat = 10;”