docs: Don't be so negative about MinGW

It builds and works, we just don't care about it and do not test
it under CI.

docs/book/src/qpa-windows.md

@@ -5,5 +5,5 @@ KDDockWidgets not only works fine on `Windows` it also implements some native fe
 - Support for native Windows drop shadow around the frame
 - Support mixing with MFC event loop
 
-Note: `MinGW` compiler is not supported, but might work.<br>
+Note: `MinGW` compiler is not tested, but probably works.<br>
 Note: KDDW is tested with Windows 10 and 11. `Windows 7` can be made to work, upon request.