[issue15821] Improve docs for PyMemoryView_FromBuffer()

[Stefan Krah]

Stefan Krah added the comment:

PyMemoryViewObject already is a PyVarObject with its own shape, strides
and suboffsets. It is the PyManagedBuffer object that directly communicates
with exporters.

The decision to store *exactly* the buffer that is obtained from the
exporter was made in #10181.

Your test case seems to pass here. :) Was it supposed to crash?

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