Setting a description to a SpecCommandGroup, for an `SpToolbarPopoverButtonPresenter` is completely useless because it does not display a tooltip

[adri09070]

See example on the object-centric popover button in the inspector: https://github.com/pharo-spec/NewTools/issues/457

Setting a description is absolutely useless because it does not display any help when we hover the popover button.

When we inspect this popover button, its attribute help is still nil