Fix doxygen warnings in MessageDisplay.

Refs #6202

Code/Mantid/MantidQt/MantidWidgets/src/MessageDisplay.cpp

@@ -43,7 +43,7 @@ namespace MantidQt
     }
 
     /**
-     * @param loggerControl Controls whether the log-level applies globally or only to this channel
+     * @param logLevelControl Sets whether this widget can control the global log level, @see LogLevelControl
      * @param parent An optional parent widget
      */
     MessageDisplay::MessageDisplay(LogLevelControl logLevelControl, QWidget *parent)