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Document format limitations of ImageStat.Stat.extrema (#3661)

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Document format limitations of ImageStat.Stat.extrema
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@ -20,6 +20,13 @@ for a region of an image.
Min/max values for each band in the image.
.. Note:: This relies on the :py:meth:`~PIL.Image.histogram` method, and simply
returns the low and high bins used. This is correct for images with 8 bits per
channel, but fails for other modes such as ``I`` or ``F``. Instead, use
:py:meth:`~PIL.Image.getextrema` to return per-band extrema for the image.
This is more correct and efficient because, for non-8-bit modes, the histogram
method uses :py:meth:`~PIL.Image.getextrema` to determine the bins used.
.. py:attribute:: count
Total number of pixels for each band in the image.