Doc: Improved example documentation

-include a section about running the example (from qtbase/doc/global)
-added links to Qt Bluetooth or Qt NFC
-updated copyright year
-added markup to a string and other small corrections
-added \brief

Task-number: QTBUG-33597
Change-Id: Ia65821549a0e2e3fbf164188982114b4741be233
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>