[Service Bus] Model factory comments (#43276)

* [Service Bus] Model factory comments

The focus of these changes is to add doc comments
to the `ServiceBusModelFactory` members, specifically
helping callers to understand what model properties
each argument populates.  Because some of the parameter
names differ from the associated model property names,
there has been some confusion.
---------

Co-authored-by: JoshLove-msft <[email protected]>

Author: jsquire

sdk/servicebus/Azure.Messaging.ServiceBus/CHANGELOG.md

@@ -9,10 +9,13 @@
 ### Bugs Fixed
 
 - Fixed an edge case where a cancellation token signaled while waiting for a throttling delay would cause a failure to reset state and service operations would continue to apply the throttle delay going forward.  ([#42952](https://github.com/Azure/azure-sdk-for-net/issues/42952))
+
 - Fixed an issue where the `ServiceBusSessionProcessor` was not respecting `ServiceBusSessionProcessorOptions.MaxConcurrentCallsPerSession` when `ServiceBusSessionProcessorOptions.SessionIds` was set to a value. ([#43157](https://github.com/Azure/azure-sdk-for-net/pull/43157))
 
 ### Other Changes
 
+- Added missing documentation for `ServiceBusModelFactory` members with a focus on clarifying what model properties each parameter to the factory methods will populate.  In some cases, parameter names differ from the associated model properties, causing confusion.  ([#42772](https://github.com/Azure/azure-sdk-for-net/issues/42772))
+
 ## 7.17.4 (2024-03-05)
 
 ### Bugs Fixed