ComboBox|TreeMenu: Clarify :row|column-span-column
ComboBox and TreeMenu warned in the doc for :row-span-column that the value must not exceed :wrap-width, but :wrap-width does not interact with the number of rows; it’s the :column-span-column that’s relevant. Also: Warn that spans must be > 0 for rows too, and that column spans <= :wrap-width are also not useful for items at menu column positions > 0. Finally, refer to items having spans, not values, as we were already talking about values in the model (and rows in the menu).
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