Document Grid's row-level tooltip generator

[OlliTietavainenVaadin]

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In the Grid documentation page's Tooltip section https://vaadin.com/docs/latest/components/grid#tooltips the documentation only covers the cell-level Tooltip generator - grid.addColumn(...).setTooltipGenerator(...). It should be mentioned that you can also set a tooltip generator for the entire row with grid.setTooltipGenerator(...).

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