Add document.patch() method

[duckduckgrayduck]

If I do something like:

document.data["ocr_engine"] = "azure"
document.save()

while a document is in a processing state from updating the page text, it returns me a failure:
squarelet.exceptions.APIError: 400 - ["You may not update access while the document is processing"]

But the field I'm updating in this case has nothing to do with access, it's just that save() calls a PUT which updates the whole document.

self.client.patch(
     f"documents/{document.id}/",
     json={"data": {"ocr_engine": ["azure"]}},
)

It would be nice if I could run something like

document.data["ocr_engine"] = "azure"
document.patch(["data"])

which is more clear and doesn't require me to call the bare client.patch method or know it exists.