New documentation from Doxygen. Added comment for function songsBell().

src/boxingtimer.h

@@ -162,6 +162,11 @@ class BoxingTimer : public QTimer {
         QSound *restBell;
         QSound *stopBell;
 
+        /**
+         * @fn void songsBell()
+         *
+         * @brief Play the bell check actual status
+         */
         void songsBell();
 
         Status mStatus;