QGAL: Update header documentation in QGALPrivate

As part of the refactoring of the setSpacing logic, we are encoraging
the analogy between the references to QGraphicsLayoutItem and to
QGraphicsAnchor, from the AnchorData point of view.

It happens that leaf anchors (ie, those that were not created by the
simplification) either represent an item or an user-created anchor.
This means that they should fetch their size information either from
a QGraphicsLayoutItem (member AnchorData->item) or from a QGraphicsAnchor
(member AnchorData->graphicsAnchor).

Thus, I'm organizing the header to make it more consistent to
the new concept.

Signed-off-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>

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