Show explicitly changes in the QML_IMPORT_PATH

https://doc.qt.io/qtdesignstudio/quick-converting-ui-projects.html explains how to convert .qmlproject to .pro projects. 

It's explicitly shown, how to add additional QML import paths in C++, but for the .pro file it is just mentioned that the QML_IMPORT_PATH variable is created. The documentation would be more explicit, if the same example path, used for addImportPaths(), would be used for QML_IMPORT_PATHS as well.

# Additional import path used to resolve QML modules in Qt Creator's code model

QML_IMPORT_PATH = qml/imports