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.
Task-number: QTBUG-88099
Change-Id: I576441d3fd2bc9855aa44694da4a2466b5f35c51
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Jani Heikkinen