Docs update for clarity on Default values of properties

[gvensan]

Request for docs update:

The following properties could use an explanation of the effect of not setting values (and a default null is assumed). Also any minimum value supported by these properties could be specified as well.

1. queueMaxMsgRedelivery
   Sets the maximum message redelivery count on consumer group queue. (Zero means retry forever).
   Default: null
2. errorQueueMaxMsgRedelivery
   Sets the maximum message redelivery count on the error queue. (Zero means retry forever).
   Default: null