Clarified return value of NumGeometries GIS function.
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@ -381,7 +381,9 @@ Accepts a single geographic field or expression and returns the memory size
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Accepts a single geographic field or expression and returns the number of
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geometries if the geometry field is a collection (e.g., a ``GEOMETRYCOLLECTION``
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or ``MULTI*`` field); otherwise returns ``None``.
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or ``MULTI*`` field). Returns 1 for single geometries.
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On MySQL, returns ``None`` for single geometries.
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``NumPoints``
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=============
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