reword

Author: adamtuck-msft

articles/communication-services/concepts/router/classification-concepts.md

@@ -26,7 +26,7 @@ The process of classifying a Job involves optionally setting the following prope
 
 ## Fallback queue
 
-The fallback queue is used when the primary classification process fails to find a queue. In this case, if a fallback queue is defined, a job will be assigned to the fallback queue instead.
+The fallback queue is used when queue selectors are unable to select a queue and the job does not have a `queueId`. In this case, if the fallback queue is defined, the job is assigned to it.
 
 ## Prioritization rule