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    Task 
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    Resolution: Done
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    P0: Blocker 
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    None
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        e84e85dd4c59f2c79f81ba4d8d7f04397eb0003c, 1aab428d19f5caeed515caf882f97c6f888e6603
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        Qt Installer Sprint 19, Qt Installer Sprint 20, Qt Installer Sprint 21, Qt Installer Sprint 22
Add Qt6 add-on doc build instructions into qtbase.
Each add-on can then enable the doc build for itself by enabling pre-defined env in the module config of the add-on.
This way each add-on does not need to duplicate the instructions in module config.