Qt 6.0.0 is new major version for Qt and so on we don't need to
list changes to the previous Qt release but guide readers to check
porting guide.
Pick-to: 6.0.0 6.0
Task-number: QTBUG-88099
Change-Id: Ifb215e8baaa19a34105f605af8f60a62d16f451b
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Jani Heikkinen