Updated a lot of minor fixes to the docs and removed warnings from qdoc

Change-Id: Ib7fd75fb93c038f9e8fa9d71b6ad01fb27b97622
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/multimedia/radio/qradiodata.cpp

@@ -113,7 +113,7 @@ void QRadioDataPrivate::_q_serviceDestroyed()
 }
 
 /*!
-    Constructs a radio data based on a media object.
+    Constructs a radio data based on a \a mediaObject and \a parent.
 
     The \a mediaObject should be an instance of \l QRadioTuner. It is preferable to use the
     \l{QRadioTuner::radioData()}{radioData} property on a QRadioTuner instance to get an instance

src/multimedia/radio/qradiotuner.cpp

@@ -104,7 +104,8 @@ public:
 
 
 /*!
-    Constructs a radio tuner based on a media service allocated by a media service \a provider.
+    Constructs a radio tuner based on a media service allocated by the default
+    media service provider.
 
     The \a parent is passed to QMediaObject.
 */