AzureStorage.Queue.delete_queue

You're seeing just the function delete_queue, go back to AzureStorage.Queue module for more information.
Link to this function

delete_queue(context, name)

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The Delete Queue operation permanently deletes the specified queue.

ref. https://docs.microsoft.com/en-us/rest/api/storageservices/delete-queue3

context |> delete_queue("booking-queue")