Doc: Replace example file lists with links to code.qt.io

Task-number: QTBUG-74391
Change-Id: If30143e106fec5a8694c47ab2376aeda36faf8e1
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/controls/doc/qtquickcontrols1.qdocconf

 include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+include($QT_INSTALL_DOCS/config/exampleurl-qtquickcontrols.qdocconf)
 
 project                 = QtQuickControls1
 description             = Qt Quick Controls 1 Reference Documentation

src/dialogs/doc/qtquickdialogs.qdocconf

 include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+include($QT_INSTALL_DOCS/config/exampleurl-qtquickcontrols.qdocconf)
 
 project                 = QtQuickDialogs
 description             = Qt Quick Dialogs Reference Documentation

src/extras/doc/qtquickextras.qdocconf

 include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+include($QT_INSTALL_DOCS/config/exampleurl-qtquickcontrols.qdocconf)
 
 project = QtQuickExtras
 description = Qt Quick Extras Reference Documentation