AzureStorage.Blob.delete_container

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

delete_container(context, container)

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Specs

delete_container(AzureStorage.Request.Context.t(), String.t()) ::
  {:ok, String.t()} | {:error, String.t()}

The Delete Container operation marks the specified container for deletion.

The container and any blobs contained within it are later deleted during garbage collection.