Update documentation on export features

QDS 3.8

QDS 3.9

We moved a few operations into a sub menu.

https://doc.qt.io/qtdesignstudio/studio-designer-developer-workflow.html

Generate CMake files and C++ source files that are used to compile the application into an executable file by selecting Build > Generate CMakeLists.txt files.

If you add or remove QML files in Qt Design Studio, you have to regenerate the CMakeLists.txt project configuration file by selecting Build > Run > Generate CMakeLists.txt Files.

https://doc.qt.io/qtdesignstudio/studio-packaging.html

Build > Generate QRC Resource File. Then select the files to package in the Add Resources dialog.