To increase accessibility for the documentation, provide altenative
descriptions for the images.
Pick-to: 6.9 6.8
Fixes: QTBUG-135116
Change-Id: Id2d97251af9af0d4222f0dc15aa5b8e266ca36f4
Reviewed-by: Safiyyah Moosa <safiyyah.moosa@qt.io>
Reviewed-by: Andreas Eliasson <andreas.eliasson@qt.io>
8e36dcf4c8