I see this correction on the sdk git but not on docs. Please update as needed.
https://docs.microsoft.com/en-us/python/api/azure-storage-queue/azure.storage.queue.queueclient?view=azure-python#azure-storage-queue-queueclient-receive-message
The PR and commit:
#1548
25f6410
Also, for update_message, pop_receipt and content don't need to be a required parameter. One place it says optional but another it says required. Details below:

WHY is it optional, because
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pop_receipt is already part of the message object. pop_receipt is only required if message object is not there like in case of cli and powershell.
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if we are issuing an update call for visibility_timeout alone, we do not need content as required parameter so it is optional.
Same for delete_message

Commit:
e9d4668
Please review and approve if it looks good.