AzureStorage.Queue.create_queue

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

create_queue(context, name)

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The Create Queue operation creates a queue in a storage account.

ref. https://docs.microsoft.com/en-us/rest/api/storageservices/create-queue4

context |> create_queue("booking-queue")