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

Task-number: QTBUG-74391
Change-Id: I4e66d50a4b98a728956e351d1603e26933dd02c7
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/bluetooth/doc/qtbluetooth.qdocconf

 include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+include($QT_INSTALL_DOCS/config/exampleurl-qtconnectivity.qdocconf)
 
 project                 = QtBluetooth
 description             = Qt Bluetooth Reference Documentation

src/nfc/doc/qtnfc.qdocconf

 include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
+include($QT_INSTALL_DOCS/config/exampleurl-qtconnectivity.qdocconf)
 
 project                 = QtNfc
 description             = Qt NFC Reference Documentation