QTimerEvent: API docs: QChronoTimer doesn't have single-shot any more

Pick-to: 6.8
Change-Id: I0c997befd752a1ca5c1bb12e4330970131d2f6e6
Reviewed-by: Thiago Macieira <[email protected]>
Reviewed-by: Marc Mutz <[email protected]>

src/corelib/kernel/qcoreevent.cpp

@@ -520,7 +520,7 @@ int QEvent::registerEventType(int hint) noexcept
     timer is started with QObject::startTimer().
 
     The QChronoTimer class provides a high-level programming interface that
-    uses signals instead of events. It also provides single-shot timers.
+    uses signals instead of events.
 
     The event handler QObject::timerEvent() receives timer events.