analyzer: more verbosity in the tool description

Change-Id: Ie259c78710c9e926f75595a7c22195efb7036532
Reviewed-on: http://codereview.qt.nokia.com/856
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/valgrind/memchecktool.h

@@ -95,6 +95,7 @@ public:
 
     QString id() const;
     QString displayName() const;
+    QString description() const;
     ToolMode mode() const;
 
 private slots: