QNI: Add missing transportMedium documentation

I forgot

Fixes: QTBUG-97409
Change-Id: I5ee94b2cc4c70b6408bb9bb9368c6876f3179783
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/network/kernel/qnetworkinformation.cpp

@@ -449,6 +449,10 @@ QNetworkInformationBackendFactory::~QNetworkInformationBackendFactory()
     \value CaptivePortal
         If the plugin supports this feature then
         the \c isBehindCaptivePortal property will be available.
+
+    \value TransportMedium
+        If the plugin supports this feature then the \c transportMedium
+        property will be available.
 */
 
 /*!
@@ -474,6 +478,32 @@ QNetworkInformationBackendFactory::~QNetworkInformationBackendFactory()
     \sa QNetworkInformation::reachability
 */
 
+/*!
+    \enum QNetworkInformation::TransportMedium
+    \since 6.3
+
+    Lists the currently recognized media with which one can connect to the
+    internet.
+
+    \value Unknown
+        Returned if either the OS reports no active medium, the active medium is
+        not recognized by Qt, or the TransportMedium feature is not supported.
+    \value Ethernet
+        Indicates that the currently active connection is using ethernet.
+        Note: This value may also be returned when Windows is connected to a
+        Bluetooth personal area network.
+    \value Cellular
+        Indicates that the currently active connection is using a cellular
+        network.
+    \value WiFi
+        Indicates that the currently active connection is using Wi-Fi.
+    \value Bluetooth
+        Indicates that the currently active connection is connected using
+        Bluetooth.
+
+    \sa QNetworkInformation::transportMedium
+*/
+
 /*!
     \internal ctor
 */