QueueOptions docs do not document the behavior of 0 max_unconfirmed_*

[pniedzielski]

Bug Report

Current Behavior
The example consumers we provide construct QueueOptions using the expression QueueOptions(0, 0, 0). Users building their first consumer are likely to copy this example code. However, the docs do not specify what the behavior of 0 for the first two arguments, max_unconfirmed_messages and max_unconfirmed_bytes, is.

Expected behavior/code
The documentation should mirror what the C++ SDK documentation for its component bmqt_queueoptions says: 0 for these queue options means there is no maximum number of unconfirmed messages for this consumer/maximum size of unconfirmed messages for this consumer.