[Development] Documenting Qt 6 API breakages

[Kai Köhne]

Hi,

We should start documenting the API changes that Qt 6.0 brings soon. This will allow getting people getting an overview, help early adopters, and will give us time to improve the documentation before the release.

Now I see that there are different paths taken:
- Eskil and others have started listing changes in a page in the qtdoc repository, https://doc-snapshots.qt.io/qt6-dev/sourcebreaks.html 
- I created a skeleton for Qt Core changes in the qtbase repository: https://codereview.qt-project.org/c/qt/qtbase/+/299664 . 

I wasn't aware of the existing page in qtdoc; Anyhow, from past experience I prefer having the documentation nearby the actual code. I therefore would like move the existing sections about Qt Quick, Qt OpenGL to the respective module documentation and let https://doc-snapshots.qt.io/qt6-dev/sourcebreaks.html just link to the module documentation pages.

Thoughts?

Kai

--
Kai Köhne, Director R&D | The Qt Company

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