More minor doc fixes.

- Missing enums
- Misspelt \fn etc
- Missing QSoundEffect C++ docs
- A few typos etc

Change-Id: I3418e79b5d50a7ab86e54d79676c33d06954bef5
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

src/multimedia/radio/qradiotuner.cpp

@@ -455,6 +455,15 @@ void QRadioTuner::searchBackward()
         d->control->searchBackward();
 }
 
+/*!
+    \enum QRadioTuner::SearchMode
+
+    Enumerates how the radio tuner should search for stations.
+
+    \value SearchFast           Use only signal strength when searching.
+    \value SearchGetStationId   After finding a strong signal, wait for the RDS station id (PI) before continuing.
+*/
+
 /*!
     Search all stations in current band